function opacity(id, opacStart, opacEnd, millisec) { 

 	var speed = Math.round(millisec / 100); 
 	var timer = 0; 

 	if(opacStart > opacEnd) { 
		for(i = opacStart; i >= opacEnd; i--) {
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed)); 
			timer++; 
		} 
	 } 
	 else if(opacStart < opacEnd) { 
		for(i = opacStart; i <= opacEnd; i++) { 
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++; 
		}
	 }
 } 

 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 + ")";
 }