function popUp(URL) {
day = new Date();
id = day.getTime();
eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=yes,location=0,statusbar=0,menubar=0,width=450, height=480, left = 200,top = 0');");
} 

function popup(mylink, windowname)
{
if (! window.focus)return true;
var href;
if (typeof(mylink) == 'string')
   href=mylink;
else
   href=mylink.href;
window.open(href, windowname, 'width=400,height=480,scrollbars=yes');
return false;
}




function validate_form ( )
{
	valid = true;

        if ( document.mailman.sender.value == "" )
        {
                alert ( "Please fill in the 'Your Name' box." );
                valid = false;
        }

        return valid;
}


function checkform ( form )
{
   
  if (form.title.value == "") {
    alert( "Introduce un título para esta búsqueda" );
    form.title.focus();
    return false ;
  }
  
  return true ;
}