var idGlobal;
function openAjax() {
	var ajax;
	try{
		ajax = new XMLHttpRequest(); 
	}catch(ee){
		try{
			ajax = new ActiveXObject("Msxml2.XMLHTTP"); 
		}catch(e){
			try{
				ajax = new ActiveXObject("Microsoft.XMLHTTP"); 
			}catch(E){
				ajax = false;
			}
		}
	}
	return ajax;
}