function opengraphicwindow(url, windowWidth, windowHeight) {
	leftLocation=(screen.availWidth/2)-(windowWidth/2);
	topLocation=(screen.availHeight/2)-(windowHeight/2);
	window.open(url, "graphic", "resizable = 0, width="+windowWidth+", height="+windowHeight+", toolbar=0, status=0, menubar=0,location=0 scrollbars=0, left="+0+", top="+0+", screenX="+0+", screenY="+0);
}