function openwin(oFile, wWidth, wHeight){
wHeight=768;
var cWidth  = window.screen.width;
var cHeight = window.screen.height;

if(cHeight && cWidth){
	var leftOffset = Math.ceil((cWidth-wWidth)/2);
	var topOffset  = Math.ceil((cHeight-wHeight)/2);
	wWidth=wWidth+20;
	msgWindow=open(oFile, "specaction", 'width='+wWidth+',height='+wHeight+',top='+topOffset+',left=' + leftOffset+', scrollbars=yes');
	}
return false;
}