pic1= new Image(320,95); pic1.src="themes/steel/images/form-button-01_down.jpg"; 
pic2= new Image(320,95); pic2.src="themes/steel/images/form-button-02_down.jpg"; 
pic3= new Image(320,95); pic3.src="themes/steel/images/form-button-03_down.jpg"; 

function submitenter(myfield,e)
{
var keycode;
if (window.event) keycode = window.event.keyCode;
else if (e) keycode = e.which;
else return true;

if (keycode == 13)
   {
   myfield.form.submit();
   return false;
   }
else
   return true;
}