var ns4 = (document.layers)? true:false
      var ie4 = (document.all)? true:false

      if (document.images)
      {							
         aoff = new Image(120,37);
         aoff.src = "button_About_OFF.gif";
         aon = new Image(120,37);
         aon.src = "button_About_ON.gif";
   						
         boff = new Image(120,37);
         boff.src = "button_Portfolio_OFF.gif";
         bon = new Image(120,37);
         bon.src = "button_Portfolio_ON.gif";
						
         coff = new Image(120,37);
         coff.src = "button_Photography_OFF.gif";
         con = new Image(120,37);
         con.src = "button_Photography_ON.gif";
						
         doff = new Image(120,37);
         doff.src = "button_Contact_OFF.gif";
         don = new Image(120,37);
         don.src = "button_Contact_ON.gif";
      }

      function imgOn(imgName, StatusComment)
      {
            if (document.images)
            {
                document[imgName].src = eval(imgName + "on.src");       
            }
            window.status=StatusComment;
      }

     function imgOff(imgName)
     {
            if (document.images)
            {
                document[imgName].src = eval(imgName + "off.src");
            }
            window.status="";
     }

	 function InsertMailLink( linkParams )
	 {
	    document.write ('<A ' + linkParams );
		document.write (' CLASS="MenuOption" HREF="mai');
        document.write ('lto:david');
        document.write ('@');
        document.write ('david-tobin');
        document.write ('.com">');		
	  }
	  function InsertMailAddr( linkParams )
	  {
	    document.write ('<A ' + linkParams );
		document.write (' HREF="mai');
        document.write ('lto:david');
        document.write ('@');
        document.write ('david-tobin');
        document.write ('.com');		
		document.write ('">david');
        document.write ('@');
        document.write ('david-tobin');		
        document.write ('.com');
        document.write ('</A>');		
	  }