function callScript(url,id){
	
	try{
		var qhead = document.getElementsByTagName('head').item(0);
		var qold  = document.getElementById(id);
	
		if (qold){ 
			qhead.removeChild(qold);
		}
		qscript = document.createElement('script');
		
		qscript.src = url;
		
		
		qscript.type = 'text/javascript';
		
		qscript.defer = true;
		qscript.id = id;
		void(qhead.appendChild(qscript));
		
	}catch(e){}
	
}