function updateEmail()

{

  var objId = 'email_field';

  var obj = null; with (document){ if (getElementById)

  obj = getElementById(objId); }

  theValue = 'hello';

  //eval("obj.style.value="+theValue);

  //eval("alert(obj.value);");

  if (obj && eval("obj.value") == 'enter email here') {

    eval("obj.value=''");

  }

}