function ampliar(x,h,w,s) {

if (navigator.appName == 'Netscape') {
h = 20 + h;
w = 20 + w;
ven = open(x,"ampliacion","height="+h+",width="+w+",status=no,toolbar=no,menubar=no,resizable=no,scrollbars="+s);

} else {

ven = open(x,"ampliacion","height="+h+",width="+w+",status=no,toolbar=no,menubar=no,resizable=no,scrollbars="+s);

}
}