sfHover = function() {
	var sfEls = document.getElementById("nav").getElementsByTagName("LI");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);

  var ok_browser = 1;    
  bName = navigator.appName;                
  bVer = parseInt(navigator.appVersion);

  ver = "n2"  
  if      (bName == "Netscape" && bVer >= 3) ver = "n3";    
  else if (bName == "Netscape" && bVer == 2) ver = "n2";    
  else if (bName == "Microsoft Internet Explorer" && bVer >= 4) ver = "e4";

  if (ver == "n3" || ver == "e4")       
  ok_browser = 0;    
else      
  ok_browser = 1;      

  if ( ok_browser == 0 )    
{ 

  image1on = new Image();  	
  image1on.src = "../images/home_page2.gif";  	
  image1off = new Image();  	
  image1off.src = "../images/home_page1.gif";
  
  image2on = new Image();  	
  image2on.src = "../images/about_us2.gif";  	
  image2off = new Image();  	
  image2off.src = "../images/about_us1.gif";  
  
  image3on = new Image();  	
  image3on.src = "../images/contact_us2.gif";  	
  image3off = new Image();  	
  image3off.src = "../images/contact_us1.gif";  	
 	
  image4on = new Image();  	
  image4on.src = "../images/residential_services2.gif";  	
  image4off = new Image();  	
  image4off.src = "../images/residential_services1.gif";  
  
  image5on = new Image();  	
  image5on.src = "../images/commercial_services2.gif";  	
  image5off = new Image();  	
  image5off.src = "../images/commercial_services1.gif";  
  
  image6on = new Image();  	
  image6on.src = "../images/maintenance_programs2.gif";  	
  image6off = new Image();  	
  image6off.src = "../images/maintenance_programs1.gif";  
  
  image7on = new Image();  	
  image7on.src = "../images/service_areas2.gif";  	
  image7off = new Image();  	
  image7off.src = "../images/service_areas1.gif";  	
 	
}      
function imageon(myname)      
{ 
  if ( ok_browser == 0 )
  {
    imgOn = eval(myname + "on.src");
    document[myname].src = imgOn;
  } 

   }
      function imageoff(myname)
      {  	if ( ok_browser == 0 )
  	{  	  imgOff = eval(myname + "off.src");
  	  document[myname].src = imgOff;
  	}
      }