[devote]

function loadScripts( src, callback ) {

	var req = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject("Microsoft.XMLHTTP");
	req.onreadystatechange = function() {
		if ( this.readyState == 4 && this.status == 200 ) {
		    var script = document.createElement("script");
		    script.onload = script.onreadystatechange = function( e ){
			    if ( ( !this.readyState || this.readyState == "loaded" || this.readyState == "complete" ) ) {
			        this.onreadystatechange = this.onload = null;
			        callback();
			    }
		    };
		    script.src = src;
		    var head = document.getElementsByTagName( "head" )[ 0 ];
		    head.appendChild( script );
		}
	}
	req.open( "GET", src, true );
	req.send( null );
}

loadScripts( link, function(){
    alert("loaded");
});

Работает только в пределах своего домена.