var opacityStart = 30;
var tempOpacity = opacityStart;
var idInterval;
var idObject = new Object();
function startIncrease(id){
	tempOpacity = opacityStart
	idObject = id;
	idInterval = setInterval("increaseOpacity()",40);
}
function increaseOpacity(){
	if (tempOpacity == 100) {
		clearInterval(idInterval);
	}
	else {
		idObject.filters.alpha.opacity = tempOpacity;
		tempOpacity += 10;
	}
}
function decreaseOpacity(id){
	clearInterval(idInterval);
	tempOpacity = opacityStart;
	id.filters.alpha.opacity = opacityStart;
}