function opacity(id, opacStart, opacEnd, millisec,degiscek_resim) {
	//speed for each frame
	var speed = Math.round(millisec / 75);
	var timer = 0;

	//determine the direction for the blending, if start and end are the same nothing happens
		a = 0;
		for(i = opacStart; i >= opacEnd; i--) {
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			setTimeout("changeOpac(" + a + ",'" + degiscek_resim + "')",(timer * speed));
			timer++;
			a++;
		}

}

//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 + ")";
}