var isCSS,isW3C,isIE4,isNN4,isIE6CSS;
function centerOnWindow(elemID){
	var obj = getRawObject(elemID);
	
	var scrollX=0,scrollY=0;
	if(document.body && typeof document.body.scrollTop !="undefined"){
		scrollX+=document.body.scrollLeft;
		scrollY+=document.body.scrollTop;
		if(document.body.parentNode && typeof document.body.parentNode.scrollTop !="undefined"){
			scrollX+=document.body.parentNode.scrollLeft;
			scrollY+=document.body.parentNode.scrollTop;
		}
	}
	else if(typeof window.pageXOffset !="undefined"){
		scrollX+=window.pageXOffset;
		scrollY+=window.pageYOffset;
	}
	//alert(getObjectWidth(obj)/2);
	
	var x = Math.round((getInsideWindowWidth()/2) - (getObjectWidth(obj)/2)) + scrollX;
	var y = scrollY + 50;
	//alert(x + "=" +  y);
	shiftTo(obj,x,y);
	
}

function getInsideWindowWidth(){
	if(window.innerWidth){
		return window.innerWidth;
	}
	else if(isIE6CSS){
		return document.body.parentElement.clientWidth;
	}
	else if(document.body && document.body.clientWidth){
		return document.body.clientWidth;
	}
}

function shiftTo(obj,x,y){
	
	if(obj){
		if(isCSS){
			//alert("in");
			var units = (typeof obj.left == "string") ? "px" : 0;
			obj.style.left = x + units;
			obj.style.top = y + units;
//            obj.style.visibility="visible";
		}
		else if(isNN4){
			obj.moveTo(x,y);
		}
	}
}


function handleScroll(evt){
	evt = (evt) ? evt : window.event;
//	centerOnWindow("mypopup");
	
	evt.cancelBubble = true;
		
}

window.onscroll = handleScroll;
window.onresize = handleScroll;
function getInsideWindowHeight(){
	if(window.innerHeight){
		return window.innerHeight;
	}
	else if(isIE6CSS){
		return document.body.parentElement.clientHeight;
	}
	else if(document.body && document.body.clientHeight){
		return document.body.clientHeight;
	}
}

function getObjectWidth(elem){
	var result = 0;
	if(elem){
		if(elem.offsetWidth){
			result = elem.offsetWidth;
		}
		else if(elem.clip && elem.clip.width){
			result = elem.clip.width;
		}
		else if(elem.style && elem.style.pixelWidth){
			result = elem.style.pixelWidth;
		}
	}    
	return parseInt(result);
}

function getObjectHeight(elem){
	
	var result = 0;
	if(elem){
		if(elem.offsetHeight){
			result = elem.offsetHeight;
		}
		else if(elem.clip && elem.clip.height){
			result = elem.clip.height;
		}
		else if(elem.style && elem.style.pixelHeight){
			result = elem.style.pixelHeight;
		}
	}    
	return parseInt(result);
}

function swapcolor(){
	
	if(document.images){
		isCSS = (document.body && document.body.style) ? true : false;
		isW3C = (isCSS && document.getElementById) ? true : false;
		isIE4 = (isCSS && document.all) ? true : false;
		isNN4 = (document.layers) ? true : false;
		isIE6CSS = (document.compatMode && document.compatMode.indexOf("CSS1")>=0) ? true : false;
		
	}
	
	centerOnWindow("mypopup");
	opacity("mypopup","visible", 0.5);
}

function getRawObject(obj){
	var theObj;
	
	if(typeof obj == "string"){
		if(isW3C){
			
			theObj = document.getElementById(obj);
		}
		else if(isIE4){
			theObj = document.all(obj);
		}
		else if(isNN4){
			theObj = seekLayer(document,obj);
		}
	}
	return theObj;
}

function getObject(obj){
	var theObj = getRawObject(obj);
	
	if(theObj && isCSS){
		theObj = theObj.style;
	}
	return theObj;
}

function seekLayer(doc, name){
	var theObj;
	for(var i=0;i < doc.layers.length ; i++){
		if(doc.layers[i].name == name){
			theObj = doc.layers[i];
			break;
		}
		if(doc.layers[i].document.layers.length > 0){
			theObj = seekLayer(document.layers[i].document, name);
		}
	}
	return theObj;
}

function opacity(id, state, sec) { 
	//speed for each frame 
	var object = document.getElementById(id)
	object.style.filter='blendTrans()';
	object.filters.blendTrans.apply();
	object.filters[0].Duration=sec;
	object.style.visibility = state;
	object.filters.blendTrans.play(); 
}