// opacity effect
function opacity(id, opacStart, opacEnd, millisec) { 
	//speed for each frame 
	var speed = Math.round(millisec / 100); 
	var timer = 0; 

	//determine the direction for the blending, if start and end are the same nothing happens 
	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++; 
		} 
	} 
} 
	
//change the opacity for different browsers 
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 + ",finishopacity=" + (100 - opacity) + ",style=0)";
	//document.getElementById(id).style.filter = "alpha(opacity=50)";
}
	
function shiftOpacity(id, millisec) { 
	//if an element is invisible, make it visible, else make it ivisible 
	//if(document.getElementById(id).style.opacity == 0) { 
	opacity(id, 0, 100, millisec); 
	//} else { 
	//	opacity(id, 100, 0, millisec); 
	//} 
}