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На одной странице я загружаю два внешних содержимого в два div (т.Е. #div1, #div2).Содержимое находится в том же сервисе. Для этого я использую это, я использую этот скрипт:

 function sack(file) {
    this.xmlhttp = null;

    this.resetData = function() {
        this.method = "POST";
        this.queryStringSeparator = "?";
        this.argumentSeparator = "amp;";
        this.URLString = "";
        this.encodeURIString = true;
        this.execute = false;
        this.element = null;
        this.elementObj = null;
        this.requestFile = file;
        this.vars = new Object();
        this.responseStatus = new Array(2);
    };

    this.resetFunctions = function() {
        this.onLoading = function() { };
        this.onLoaded = function() { };
        this.onInteractive = function() { };
        this.onCompletion = function() { };
        this.onError = function() { };
        this.onFail = function() { };
    };

    this.reset = function() {
        this.resetFunctions();
        this.resetData();
    };

    this.createAJAX = function() {
        try {
            this.xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e1) {
            try {
                this.xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e2) {
                this.xmlhttp = null;
            }
        }

        if (! this.xmlhttp) {
            if (typeof XMLHttpRequest != "undefined") {
                this.xmlhttp = new XMLHttpRequest();
            } else {
                this.failed = true;
            }
        }
    };

    this.setVar = function(name, value){
        this.vars[name] = Array(value, false);
    };

    this.encVar = function(name, value, returnvars) {
        if (true == returnvars) {
            return Array(encodeURIComponent(name), encodeURIComponent(value));
        } else {
            this.vars[encodeURIComponent(name)] = Array(encodeURIComponent(value), true);
        }
    }

    this.processURLString = function(string, encode) {
        encoded = encodeURIComponent(this.argumentSeparator);
        regexp = new RegExp(this.argumentSeparator   "|"   encoded);
        varArray = string.split(regexp);
        for (i = 0; i < varArray.length; i  ){
            urlVars = varArray[i].split("=");
            if (true == encode){
                this.encVar(urlVars[0], urlVars[1]);
            } else {
                this.setVar(urlVars[0], urlVars[1]);
            }
        }
    }

    this.createURLString = function(urlstring) {
        if (this.encodeURIString amp;amp; this.URLString.length) {
            this.processURLString(this.URLString, true);
        }

        if (urlstring) {
            if (this.URLString.length) {
                this.URLString  = this.argumentSeparator   urlstring;
            } else {
                this.URLString = urlstring;
            }
        }

        // prevents caching of URLString
        this.setVar("rndval", new Date().getTime());

        urlstringtemp = new Array();
        for (key in this.vars) {
            if (false == this.vars[key][1] amp;amp; true == this.encodeURIString) {
                encoded = this.encVar(key, this.vars[key][0], true);
                delete this.vars[key];
                this.vars[encoded[0]] = Array(encoded[1], true);
                key = encoded[0];
            }

            urlstringtemp[urlstringtemp.length] = key   "="   this.vars[key][0];
        }
        if (urlstring){
            this.URLString  = this.argumentSeparator   urlstringtemp.join(this.argumentSeparator);
        } else {
            this.URLString  = urlstringtemp.join(this.argumentSeparator);
        }
    }

    this.runResponse = function() {
        eval(this.response);
    }

    this.runAJAX = function(urlstring) {
        if (this.failed) {
            this.onFail();
        } else {
            this.createURLString(urlstring);
            if (this.element) {
                this.elementObj = document.getElementById(this.element);
            }
            if (this.xmlhttp) {
                var self = this;
                if (this.method == "GET") {
                    totalurlstring = this.requestFile   this.queryStringSeparator   this.URLString;
                    this.xmlhttp.open(this.method, totalurlstring, true);
                } else {
                    this.xmlhttp.open(this.method, this.requestFile, true);
                    try {
                        this.xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded")
                    } catch (e) { }
                }

                this.xmlhttp.onreadystatechange = function() {
                    switch (self.xmlhttp.readyState) {
                        case 1:
                            self.onLoading();
                            break;
                        case 2:
                            self.onLoaded();
                            break;
                        case 3:
                            self.onInteractive();
                            break;
                        case 4:
                            self.response = self.xmlhttp.responseText;
                            self.responseXML = self.xmlhttp.responseXML;
                            self.responseStatus[0] = self.xmlhttp.status;
                            self.responseStatus[1] = self.xmlhttp.statusText;

                            if (self.execute) {
                                self.runResponse();
                            }

                            if (self.elementObj) {
                                elemNodeName = self.elementObj.nodeName;
                                elemNodeName.toLowerCase();
                                if (elemNodeName == "input"
                                || elemNodeName == "select"
                                || elemNodeName == "option"
                                ) {
                                    self.elementObj.value = self.response;
                                } else {
                                    self.elementObj.innerHTML = self.response;
                                }
                            }
                            if (self.responseStatus[0] == "200") {
                                self.onCompletion();
                            } else {
                                self.onError();
                            }

                            self.URLString = "";
                            /* These lines were added by Alf Magne Kalleland ref. info on the sack home page. It prevents memory leakage in IE */

                            delete self.xmlhttp['onreadystatechange'];
                            self.xmlhttp=null;
                            self.responseStatus=null;
                            self.response=null;
                            self.responseXML=null;

                            break;
                    }
                };

                this.xmlhttp.send(this.URLString);
            }
        }
    };

    this.reset();
    this.createAJAX();
}
var enableCache = true;
var jsCache = new Array();

var dynamicContent_ajaxObjects = new Array();

function ajax_showContent(divId,ajaxIndex,url)
{
    var targetObj = document.getElementById(divId);
    targetObj.innerHTML = dynamicContent_ajaxObjects[ajaxIndex].response;
    if(enableCache){
        jsCache[url] =  dynamicContent_ajaxObjects[ajaxIndex].response;
    }
    dynamicContent_ajaxObjects[ajaxIndex] = false;

    ajax_parseJs(targetObj)
}

function ajax_loadContent(divId,url)
{
    if(enableCache amp;amp; jsCache[url]){
        document.getElementById(divId).innerHTML = jsCache[url];
        ajax_parseJs(document.getElementById(divId))
        evaluateCss(document.getElementById(divId))
        return;
    }

    var ajaxIndex = dynamicContent_ajaxObjects.length;
    document.getElementById(divId).innerHTML = '<p class="sidebar_element" style="background-color: #ffffff; border:none;" align="center">Operazione in corso...<br /><br/><img src="http://www.wiitalia.it/wp-content/themes/wiitalia/images/loading.gif"><br></p>';
    dynamicContent_ajaxObjects[ajaxIndex] = new sack();

    if(url.indexOf('?')>=0){
        dynamicContent_ajaxObjects[ajaxIndex].method='GET';
        var string = url.substring(url.indexOf('?'));
        url = url.replace(string,'');
        string = string.replace('?','');
        var items = string.split(/amp;/g);
        for(var no=0;no<items.length;no  ){
            var tokens = items[no].split('=');
            if(tokens.length==2){
                dynamicContent_ajaxObjects[ajaxIndex].setVar(tokens[0],tokens[1]);
            }   
        }   
        url = url.replace(string,'');
    }


    dynamicContent_ajaxObjects[ajaxIndex].requestFile = url;    // Specifying which file to get
    dynamicContent_ajaxObjects[ajaxIndex].onCompletion = function(){ ajax_showContent(divId,ajaxIndex,url); };  // Specify function that will be executed after file has been found
    dynamicContent_ajaxObjects[ajaxIndex].runAJAX();        // Execute AJAX function    


}

function ajax_parseJs(obj)
{
    var scriptTags = obj.getElementsByTagName('SCRIPT');
    var string = '';
    var jsCode = '';
    for(var no=0;no<scriptTags.length;no  ){    
        if(scriptTags[no].src){
            var head = document.getElementsByTagName("head")[0];
            var scriptObj = document.createElement("script");

            scriptObj.setAttribute("type", "text/javascript");
            scriptObj.setAttribute("src", scriptTags[no].src);      
        }else{
            if(navigator.userAgent.toLowerCase().indexOf('opera')>=0){
                jsCode = jsCode   scriptTags[no].text   'n';
            }
            else
                jsCode = jsCode   scriptTags[no].innerHTML; 
        }

    }

    if(jsCode)ajax_installScript(jsCode);
}


function ajax_installScript(script)
{       
    if (!script)
        return;     
    if (window.execScript){         
        window.execScript(script)
    }else if(window.jQuery amp;amp; jQuery.browser.safari){ // safari detection in jQuery
        window.setTimeout(script,0);
    }else{          
        window.setTimeout( script, 0 );
    } 
}   


function evaluateCss(obj)
{
    var cssTags = obj.getElementsByTagName('STYLE');
    var head = document.getElementsByTagName('HEAD')[0];
    for(var no=0;no<cssTags.length;no  ){
        head.appendChild(cssTags[no]);
    }   
}
  

Возможно ли вызвать во втором div функцию, которая расположена в первом div?

Нет, это ограничение политики того же источника, которое не позволит вам выполнить такое действие.

Вы можете вызывать функции в двух окнах, фреймах и iframes, при условии, что оба они находятся в одном домене. Функции должны находиться в глобальной области видимости, которая совпадает со свойствами объекта window

В окне 1:

 function windowOneFunction(){
   //do something
}
  

В окне 2

 windowOne.windowOneFunction()