function openW(file,wW,wH,scr){
	
	var posX = (screen.width-wW) / 2; 
	var posY = (screen.height-wH) / 2; 
	
	if(!myWin){
		var myWin = window.open(file, 'varW', 'Height='+ wH +'px, Width='+ wW +'px,resizable=no,top='+posY+',left='+posX+',scrollbars='+scr)
		myWin.focus();	
	}
}