function randomString(string_length) {
	var chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz";
	var randomstring = '';
	for (var i=0; i<string_length; i++) {
		var rnum = Math.floor(Math.random() * chars.length);
		randomstring += chars.substring(rnum,rnum+1);
	}
	return randomstring;
}

function file(fichier)
{
	 if(window.XMLHttpRequest) // FIREFOX
				xhr_object = new XMLHttpRequest(); 
	 else if(window.ActiveXObject) // IE
				xhr_object = new ActiveXObject("Microsoft.XMLHTTP"); 
	 else 
				return(false); 
	 try {
		xhr_object.overrideMimeType("text/html; charset=ISO-8859-1");
		//xhr_object.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; Charset=iso-8859-1");   	 
	} catch (x) {
	}	
	 xhr_object.open("GET", fichier, false); 
	 xhr_object.send(null); 
	 if(xhr_object.readyState == 4) {
		 return(xhr_object.responseText);
	 }
	 else return(false);
}