function fullSize(k){
	if(k){			
		document.getElementById('overlay').style.display="block";	
		if( document.body.clientHeight>document.documentElement.clientHeight){
			document.getElementById('overlay').style.height = document.body.clientHeight+"px";
		}else{
			document.getElementById('overlay').style.height = document.documentElement.clientHeight+"px";
		}	
		document.getElementById('videoHelp').style.margin = 0;	
		document.getElementById('videoHelp').style.position ="absolute";
		var k=document.body.scrollTop?document.body.scrollTop:document.documentElement.scrollTop+(document.documentElement.clientHeight-760)/2;
		document.getElementById('videoHelp').style.top=k+"px";	
		document.getElementById('videoHelp').style.left=(document.documentElement.clientWidth-1000)/2+"px";
		document.getElementById('videoHelp').style.width=1000+"px";
		document.getElementById('videoHelp').style.height=760+"px";		
		
	}else{
		document.getElementById('overlay').style.display="none";
		document.getElementById('videoHelp').style.position ="static";
		document.getElementById('videoHelp').style.height =630+"px";	
		document.getElementById('videoHelp').style.width =760+"px";
		document.getElementById('videoHelp').style.top =0;	
		document.getElementById('videoHelp').style.left =0;	
		document.getElementById('videoHelp').style.margin = "10px 0";			
	}





}