function getXhr(){
	var xhr = null; 
	if(window.XMLHttpRequest){
		xhr = new XMLHttpRequest(); 
	} else if(window.ActiveXObject){ 
		try {
			xhr = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			xhr = new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
	else {
		alert("Votre navigateur ne supporte pas les objets XMLHTTPRequest..."); 
		xhr = false; 
	} 
	return xhr;
}

function go(c){
	if(!c.data.replace(/\s/g,''))
		c.parentNode.removeChild(c);
}

function clean(d){
	var bal=d.getElementsByTagName('*');

	for(i=0;i<bal.length;i++){
		a=bal[i].previousSibling;
		if(a && a.nodeType==3)
			go(a);
		b=bal[i].nextSibling;
		if(b && b.nodeType==3)
			go(b);
	}
	return d;
}