function openCW(anchor,w,h,name,params){
	openCenteredWindow(anchor,w,h,name,params);
}

function openCenteredWindow(anchor,w,h,name,params) {
	sw=screen.availWidth;
	sh=screen.availHeight;
	xpos=(sw-w)/2;
	ypos=(sh-h)/2;
	var win=window.open(anchor,name,"width="+w+",height="+h+",top="+ypos+",left="+xpos+","+params);
	win.focus();
	return win;
}