var shadeObj=null;
var shadeEvent=null;
var shadeCounter=20;
var shadeTrigger=1.0/shadeCounter;

function runIntro(page){
	if(page!=0){
		deleteShade();
	}
	else{
		var obj=document.getElementById("divIntro");
		obj.style.bottom="0px";
		obj.style.right="0px";
		shadeObj=obj;
		shadeEvent=window.setInterval("doShade()", 50);
	}
}

function doShade(){
	if(shadeCounter<=0){
		window.clearInterval(shadeEvent);
		deleteShade();
	}
	else{
		shadeCounter--;
		shadeObj.style.opacity=shadeCounter*shadeTrigger;
		shadeObj.style.filter="alpha(opacity="+parseInt(shadeCounter*shadeTrigger*100)+")";
		shadeObj.style.MozOpacity=shadeCounter*shadeTrigger;
	}
}

function deleteShade(){
	if(shadeObj!=null){
		shadeObj.parentNode.removeChild(shadeObj);
		shadeObj=null;
	}
}

//img chg

function chgImage(obj,filename){
	obj.src=filename;
}