function abrirVentana2(myurl,wh){
     var newWindow;
     var props = 'scrollBars=yes,resizable=yes,toolbar=no,menubar=no,location=no,directories=no,';
     newWindow = window.open(myurl,"impi",props+wh);
}

function abrirVentana(url,id,w,h){
    var newWindow;
	var props = 'scrollBars=yes,resizable=yes,toolbar=no,menubar=no,location=no,directories=no,';
	newWindow = window.open(url,id,props+'width='+w+',height='+h);
	centra_popup(newWindow,w,h);
}

function centra_popup(variableventana,ancho,alto){
    var sw = (screen.width) ? (screen.width-ancho)/2 : 0;
    var sh = (screen.height) ? (screen.height-alto)/2 : 0;
    variableventana.moveTo(sw,sh);
}