MouseX & MouseY false values when fscreen on ios

var CANVAS_RESIZE_MODE=1;	//0=locked, 1=stretch, 2=resize

var CANVAS_WIDTH=224;
var CANVAS_HEIGHT=288;

window.onload=function( e ){

	var canvas=document.getElementById( "GameCanvas" );
	var splitter=document.getElementById( "Splitter" );
	var console=document.getElementById( "GameConsole" );
	
	var mouseDown=false;
	var startY=0;
	var canvasH=CANVAS_HEIGHT;
	var cmousemove=null;
	var cmouseup=null;
	var cmouseout=null;
	var fscreen=true;

	function mouseX( e ){
		var x=e.clientX+document.body.scrollLeft;
		var c=canvas;
		while( c ){
			x-=c.offsetLeft;
			c=c.offsetParent;
		}
		return x*xscale;
	}
	
	function mouseY( e ){
		var y=e.clientY+document.body.scrollTop;
		var c=canvas;
		while( c ){
			y-=c.offsetTop;
			c=c.offsetParent;
		}
		return y*yscale;
	}

	function touchX( touch ){
		var x=touch.pageX;
		var c=canvas;
		while( c ){
			x-=c.offsetLeft;
			c=c.offsetParent;
		}
		return x;
	}			
	
	function touchY( touch ){
		var y=touch.pageY;
		var c=canvas;
		while( c ){
			y-=c.offsetTop;
			c=c.offsetParent;
		}
		return y;
	}