if (document.images) {

	 var nav01on = new Image();
     nav01on.src = "../images/top_nav_issues_on.gif";
	 var nav02on = new Image();
     nav02on.src = "../images/top_nav_tools_on.gif";
	 var nav03on = new Image();
     nav03on.src = "../images/top_nav_marketplace_on.gif";
	 var nav04on = new Image();
     nav04on.src = "../images/top_nav_mytoolkit_on.gif";
	 var nav05on = new Image();
     nav05on.src = "../images/top_nav_himss_on.gif";

	 var nav01a = new Image();
     nav01a.src = "../images/top_nav_issues_a.gif";
	 var nav02a = new Image();
     nav02a.src = "../images/top_nav_tools_a.gif";
	  var nav03a = new Image();
     nav03a.src = "../images/top_nav_marketplace_a.gif";
	 var nav04a = new Image();
     nav04a.src = "../images/top_nav_mytoolkit_a.gif";
	 var nav05a = new Image();
     nav05a.src = "../images/top_nav_himss_a.gif";

	 var nav01off = new Image();
     nav01off.src = "../images/top_nav_issues.gif";
     var nav02off = new Image();
     nav02off.src = "../images/top_nav_tools.gif";
	 var nav03off = new Image();
     nav03off.src = "../images/top_nav_marketplace.gif";
     var nav04off = new Image();
     nav04off.src = "../images/top_nav_mytoolkit.gif";
     var nav05off = new Image();
     nav05off.src = "../images/top_nav_himss.gif";

	 var Lon = new Image();
	 Lon.src = "../images/top_main_line_l.gif";
	 var Ron = new Image();
	 Ron.src = "../images/top_main_line_r.gif";

     var LineOff = new Image();
	 LineOff.src = "../images/top_main_line.gif";
	 
	 
}

function imgOn(imgName01, imgName02, imgName03) {
     if (document.images) {
          document[imgName01].src = eval(imgName01 + "on").src;
          
		  if (imgName02 == null) {
		  } else {
		  	  document[imgName02].src = eval(Lon).src;
		  }
		  
		  if (imgName03 == null) {
		  } else {
	          document[imgName03].src = eval(Ron).src;
		  }
     }
}

function imgOff(imgName01, imgName02, imgName03) {
     if (document.images) {
          document[imgName01].src = eval(imgName01 + "off").src;
		  
		  if (imgName02 == null) {
		  } else {
	          document[imgName02].src = eval(LineOff).src;
		  }

          if (imgName03 == null) {
		  } else {
		      document[imgName03].src = eval(LineOff).src;
     	  }
	 }
}