function getElementsByClassName(className, tag, elm){
	var testClass = new RegExp("(^|s)" + className + "(s|$)");
	var tag = tag || "*";
	var elm = elm || document;
	var elements = (tag == "*" && elm.all)? elm.all : elm.getElementsByTagName(tag);
	var returnElements = [];
	var current;
	var length = elements.length;
	for(var i=0; i<length; i++){
		current = elements[i ];
		if(testClass.test(current.className)){
			returnElements.push(current);
		}
	}
	return returnElements;
}


function AlphaObject ( object )
{

try
{

	object.style.height="100%";//Bug IE
	
	//object.style.opacity = "0.85";
	//object.style.filter = "alpha(opacity=85)";
}
catch (e) {
	alert('Erreur: ' + e);
}	
/*	
	            width: 100%;
            height: 100%;
            background-color: black;
            z-index:1001;
            -moz-opacity: 0.8;
            opacity:.80;
            filter: alpha(opacity=80);
*/			
}


function AlphaIZ( name_class )
{

	var object = getElementsByClassName(name_class);

	for( i = 0 ; i < object.length; i++)
	{
		AlphaObject(object[i]);
	}
}

function appliCSS()
{	
	AlphaIZ('level2');
	AlphaIZ('level3');
	AlphaIZ('level4');
	
}

$(appliCSS());
//appliCSS();