function popUp(theURL,winName,w,h,scroll){	
	TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
	LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
	features = 'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',status=yes';
	janela=window.open(theURL,winName,features);
	janela.focus();
};