browserName = navigator.appName;
browserVer = parseInt ( navigator.appVersion );
version = "n2";
if ( browserName == "Netscape" && browserVer >= 3 ) version = "n3";
if ( browserName == "Microsoft Internet Explorer" && browserVer >= 4 ) version = "e4";
if ( version == "n3" || version == "e4" ) {

   PB_About_Us_Dn          = new Image ( 71 , 37 );
   PB_About_Us_Up          = new Image ( 71 , 37 );
   PB_Contact_Us_Dn        = new Image ( 71 , 37 );
   PB_Contact_Us_Up        = new Image ( 71 , 37 );
   PB_Downloads_Dn         = new Image ( 71 , 37 );
   PB_Downloads_Up         = new Image ( 71 , 37 );
   PB_Graphics_Dn          = new Image ( 71 , 37 );
   PB_Graphics_Up          = new Image ( 71 , 37 );
   PB_IT_Services_Dn       = new Image ( 71 , 37 );
   PB_IT_Services_Up       = new Image ( 71 , 37 );
   PB_Portfolio_Dn         = new Image ( 71 , 37 );
   PB_Portfolio_Up         = new Image ( 71 , 37 );
   PB_Prices_Dn            = new Image ( 71 , 37 );
   PB_Prices_Up            = new Image ( 71 , 37 );
   PB_References_Dn        = new Image ( 71 , 37 );
   PB_References_Up        = new Image ( 71 , 37 );   
   PB_Site_Map_Dn          = new Image ( 71 , 37 );
   PB_Site_Map_Up          = new Image ( 71 , 37 );  
   PB_Social_Dn            = new Image ( 71 , 37 );
   PB_Social_Up            = new Image ( 71 , 37 );
   
   PB_About_Us_Dn.src      = "images/Buttons/Hover/PB-About-Us-Dn.gif";
   PB_About_Us_Up.src      = "images/Buttons/Hover/PB-About-Us-Up.gif";
   PB_Contact_Us_Dn.src    = "images/Buttons/Hover/PB-Contact-Us-Dn.gif";
   PB_Contact_Us_Up.src    = "images/Buttons/Hover/PB-Contact-Us-Up.gif";
   PB_Downloads_Dn.src     = "images/Buttons/Hover/PB-Downloads-Dn.gif";
   PB_Downloads_Up.src     = "images/Buttons/Hover/PB-Downloads-Up.gif";
   PB_Graphics_Dn.src      = "images/Buttons/Hover/PB-Graphics-Dn.gif";
   PB_Graphics_Up.src      = "images/Buttons/Hover/PB-Graphics-Up.gif";
   PB_IT_Services_Dn.src   = "images/Buttons/Hover/PB-IT-Services-Dn.gif";
   PB_IT_Services_Up.src   = "images/Buttons/Hover/PB-IT-Services-Up.gif";
   PB_Portfolio_Dn.src     = "images/Buttons/Hover/PB-Portfolio-Dn.gif";
   PB_Portfolio_Up.src     = "images/Buttons/Hover/PB-Portfolio-Up.gif";
   PB_Prices_Dn.src        = "images/Buttons/Hover/PB-Prices-Dn.gif";
   PB_Prices_Up.src        = "images/Buttons/Hover/PB-Prices-Up.gif";   
   PB_References_Dn.src    = "images/Buttons/Hover/PB-References-Dn.gif";
   PB_References_Up.src    = "images/Buttons/Hover/PB-References-Up.gif";
   PB_Site_Map_Dn.src      = "images/Buttons/Hover/PB-Site-Map-Dn.gif";
   PB_Site_Map_Up.src      = "images/Buttons/Hover/PB-Site-Map-Up.gif";      
   PB_Social_Dn.src        = "images/Buttons/Hover/PB-Social-Dn.gif";
   PB_Social_Up.src        = "images/Buttons/Hover/PB-Social-Up.gif";
}
function button_dn ( imgName ) {
   if (version == "n3" || version == "e4") {
      butDn = eval(imgName + "_Dn.src");
      document [imgName].src = butDn;
   }
}
function button_up ( imgName ) {
   if (version == "n3" || version == "e4") {
      butUp = eval(imgName + "_Up.src");
      document [imgName].src = butUp;
   }
}