var blockerAlpha = 0;
var blockerFadeIn;
var blockerFadeOut;

function changeBlockerAlpha(newAlpha){
	blockerAlpha = newAlpha;
	element = document.getElementById("blocker");
	element.style.opacity = newAlpha/100;
	element.style.MozOpacity = newAlpha/100;
	element.style.KhtmlOpacity =newAlpha/100;
	/*if (navigator.appName=="Microsoft Internet Explorer"){
		element.filters.alpha.opacity=newAlpha;
	}*/
}

function zeroBlockerAlpha(){
	changeBlockerAlpha(0);
}

function increaseBlockerAlpha(){
	if (blockerAlpha>=80){
		clearInterval(blockerFadeIn);
		return;
	}
	changeBlockerAlpha(blockerAlpha+20)
}

function decreaseBlockerAlpha(){
	if (blockerAlpha<=0){
		clearInterval(blockerFadeOut);
		hideBlocker();
		return;
	}
	changeBlockerAlpha(blockerAlpha-20);
}

function fadeBlockerIn(){
	clearInterval(blockerFadeOut);
	zeroBlockerAlpha();
	//blockerFadeIn = setInterval("increaseBlockerAlpha()",10);
	changeBlockerAlpha(80);
	//debug ("fadeBlockerIn");
}

function fadeBlockerOut(){
	clearInterval(blockerFadeIn);
	//blockerFadeOut = setInterval("decreaseBlockerAlpha()",10);
	changeBlockerAlpha(0);
	hideBlocker();
}