function PopUp(url, left, top, width, height, toolbar, menubar, statusbar, scrollbar, resizable/*, modal*/)
{
	toolbar_str = toolbar ? 'yes' : 'no';
	menubar_str = menubar ? 'yes' : 'no';
	statusbar_str = statusbar ? 'yes' : 'no';
	scrollbar_str = scrollbar ? 'yes' : 'no';
	resizable_str = resizable ? 'yes' : 'no';
	d = new Date();
	/*if (modal  && ie ) 
	{
		var ventana = window.showModalDialog(url,"","dialogWidth:"+width+"px;dialogHeight:"+height+"px;dialogTop:"+top+"px;dialogLeft:"+left+"px"); 
	}
	else*/
	{
		var ventana = window.open(url, 'nueva'+d.getTime(), 'left='+left+',top='+top+',width='+width+',height='+height+',toolbar='+toolbar_str+',menubar='+menubar_str+',status='+statusbar_str+',scrollbars='+scrollbar_str+',resizable='+resizable_str);
		ventana.focus();
	}
}

function PopUpCentrado(url, width, height, scrollbar/*, modal*/)
{
	var left = screen.width/2 - width/2;
	var top = screen.height/2 - height/2;
	PopUp(url, left, top, width, height,0,0,0,scrollbar,0/*, modal*/);
}