function doClear(theText) {
     if (theText.value == theText.defaultValue) {
         theText.value = ""
     }
 }
 
 if (document.images)
    {
      preload_image_object = new Image();
      // set image url
      image_url = new Array();
      image_url[0] = "app-images/nav_aboutus_over.jpg";
      image_url[1] = "app-images/nav_capabilities_over.jpg";
      image_url[2] = "app-images/nav_casestudies_over.jpg";
      image_url[3] = "app-images/nav_contactus_over.jpg";
	  image_url[4] = "app-images/nav_home_over.jpg";
	  image_url[5] = "app-images/nav_roomhire_over.jpg";
	  image_url[6] = "app-images/nav_services_over.jpg";

       var i = 0;
       for(i=0; i<=6; i++) 
         preload_image_object.src = image_url[i];
    }

    //-->