<!-- <![CDATA[
function setBox(idElement){
	var speed = Math.round(300 / 100);
    var timer = 0; 
	var timeOut =0;
	for(i = 0; i <= 100; i++){
		timeOut = setTimeout("changeOpac(" + i + ",'main_content')",(timer * speed));
		timer++;
   	}
	clearTimeout(timeOut);
}

function changeOpac(opacity, id) { 
    var object = document.getElementById(id).style; 
    object.opacity = (opacity / 100); 
    object.MozOpacity = (opacity / 100); 
    object.KhtmlOpacity = (opacity / 100); 
   	object.filter = "alpha(opacity=" + opacity + ")"; 
	/*var object = document.getElementById("box_r_1").style; 
	object.filter = "alpha(opacity=" + opacity  + ")"; 
	var object = document.getElementById("box_r_2").style; 
	object.filter = "alpha(opacity=" + opacity  + ")"; */
} 

// ]]> -->