var xZoomStart = 0;
var xMouseStart = 0;
var newHeight = 0;
var newWidth = 0;
function mousePosition(ev){
	ev = ev || window.event;
	if(ev.pageX || ev.pageY){
		return {x:ev.pageX, y:ev.pageY};
	}
	return {
		x:ev.clientX + document.body.scrollLeft - document.body.clientLeft,
		y:ev.clientY + (document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop)
	};
}
function zoomStart(ev){
	var mousePos			= mousePosition(ev);
	xMouseStart 			= mousePos.x;
	xZoomStart	 			= parseInt($('zoomPointer').style.left || 0);
	document.onmousemove 	= zoomMove;
	document.onmouseup   	= zoomStop;
	if(document.all) {
		ev.cancelBubble = true;
		ev = false;
	} else {
		ev.preventDefault();
	}

}
function zoomMove(ev){
	ev = ev || window.event;
	var mousePos = mousePosition(ev);
	
	newX = xZoomStart + mousePos.x - xMouseStart;
	if(newX < -130) newX = -130;
	if(newX > 130) newX = 130;
	$('zoomPointer').style.left = newX + 'px';
	newX = Math.round(newX/10)*10;
	newHeight = startHeight * (130 + newX )/130;
	newWidth = startWidth * (130 + newX )/130;
	
	$('iFrameBody').style.height = newHeight + 'px';
	$('iFrameBody').style.width = newWidth + 'px';
	$('gameHolder').style.height = newHeight + 'px';
	return false;
	
	if(document.all) {
		ev.cancelBubble = true;
		ev = false;
	} else {
		ev.preventDefault();
	}
}
function zoomStop (){
	document.onmousemove = null;
	document.onmouseup   = null;
}