function loadVirtualEarthLibs(onScriptLoadFunc){ //lazy-loading in background, pass onScriptLoad function name if needed

if (window.VEMap){ return; } //already loaded, dont need to download/run script again

var compat_script_url = “http://dev.virtualearth.net/mapcontrol/v6.2/js/atlascompat.js”;
var main_script_url = “https://dev.virtualearth.net/mapcontrol/mapcontrol.ashx?v=6.2&mkt=en-us&s=1″+ ((onScriptLoadFunc)? (“&onScriptLoad=”+onScriptLoadFunc) : “”);

if (!(window.attachEvent)) {
$.ajax({ type: “GET”, url: compat_script_url, success: function(){
$.ajax({ type: “GET”, url: main_script_url, success: function(){ }, dataType: “script”, cache: true });
}, dataType: “script”, cache: true });
} else {
$.ajax({ type: “GET”, url: main_script_url, success: function(){ }, dataType: “script”, cache: true });
}

}

so i set that with jquery on document.ready…

$(function(){
loadVirtualEarthLibs();
});

And then later on when my “ajax questionnaire” is done, a Bing map is dynamically loaded …

if (!window.VEMap) { // I make sure again when i actually need to use my library, if its available. if not, try to get it again (edge case/unlikely), otherwise just build the map. should be quick since library was loaded while you were reading the page.
loadVirtualEarth(‘initMap’);
} else {
initMap();
}

… and the initMap is just initialization code for building the map

function initMap()
{
try
{
map = new VEMap(‘map_canvas’);
…

}