function updateContent() {
  var tobj = document.getElementById("mail_job_email_template_id");
  var tval = tobj.options[tobj.selectedIndex].value;
  var bobj = document.getElementById("mail_job_banner_id");
  var bval = bobj.options[bobj.selectedIndex].value;
  var pobj = document.getElementById("mail_job_photo_id");
  var pval = pobj.options[pobj.selectedIndex].value;
  var gobj = document.getElementById("mail_job_greeting_id");
  var gval = gobj.options[gobj.selectedIndex].value;

  var myframe = document.getElementById("previewFrame");
   myframe.src = "/send/preview/" + tval + "?banner_id=" + bval + "&photo_id=" + pval + "&greeting_id=" + gval;
}

function setColor(color) {
  var x=document.getElementById('mail_job_email_template_id');

  for (i=0;i<x.length;i++) { 
    if ( x.options[i].text == color ) { 
      x.selectedIndex = i 
    } 
  };

  updateContent();

};