function getWindowWidth(){
	if(window.innerWidth){
		return window.innerWidth;
	}else if(document.documentElement && document.documentElement.clientWidth){
		return document.documentElement.clientWidth;
	}else if ( document.body && document.body.clientWidth){
		return document.body.clientWidth;
	}
}
function getWindowHeight(){
	if(window.innerHeight){
		return window.innerHeight;
	}else if(document.documentElement && document.documentElement.clientHeight){
		return document.documentElement.clientHeight;
	}else if ( document.body && document.body.clientHeight){
		return document.body.clientHeight;
	}
}