function popup (plaats,intImgW,intImgH)
{
	var intExtraPixelsX = 40;
	var intExtraPixelsY = 0;
	var intClearX = 0;
	var intClearY = 120;
	var intWindowMinWidth = 600;
	
	var intImgWidth = (intImgW) ? intImgW : 300;
	var intImgHeight = (intImgH) ? intImgH : 400;
	
	var intAvailWidth = self.screen.availWidth;
	var intAvailHeight = self.screen.availHeight;
	
	var intWindowTargetWidth = intImgWidth + intExtraPixelsX;
	if (intWindowTargetWidth>(intAvailWidth-intClearX)) intWindowTargetWidth = intAvailWidth-intClearX;
	if (intWindowTargetWidth<intWindowMinWidth) intWindowTargetWidth = intWindowMinWidth;
	
	var intWindowTargetHeight = intAvailHeight - intClearY;
	
	var intTargetX = (intAvailWidth-intWindowTargetWidth)/2;
	var intTargetY = 20;
		
	var programmaOpened = false;
	
	programma = window.open( plaats, 'foto', 'toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=1,width='+intWindowTargetWidth+',height='+intWindowTargetHeight+',left='+intTargetX+',top='+intTargetY);
	programma.focus();
	
	programmaOpened = true;
}