browserName = navigator.appName;
     browserVer = parseInt(navigator.appVersion);
             if (browserName == "Netscape", "Microsoft Internet Explorer" && browserVer >= 3) version = "n3";
             else version = "n2";
             
             if (version == "n3") {
				 
             s1on = new Image();
             s1on.src = "images/tophover_05.png";
             s2on = new Image();
             s2on.src = "images/tophover_06.png";
             s3on = new Image();
             s3on.src = "images/tophover_07.png";
             s4on = new Image();
             s4on.src = "images/tophover_08.png";
             s5on = new Image();
             s5on.src = "images/tophover_09.png"; 
             s6on = new Image();
             s6on.src = "images/i-thai_on.jpg";
			 s7on = new Image();
             s7on.src = "images/i-eng_on.jpg"; 

		 
             s1off = new Image();
             s1off.src = "images/top_05.png";
             s2off = new Image();
             s2off.src = "images/top_06.png";
             s3off = new Image();
             s3off.src = "images/top_07.png";
             s4off = new Image();
             s4off.src = "images/top_08.png";
             s5off = new Image();
             s5off.src = "images/top_09.png"; 
             s6off = new Image();
             s6off.src = "images/i-thai.jpg";
			 s7off = new Image();
             s7off.src = "images/i-eng.jpg"; 
                   
             }

     function img_act(imgName) {
             if (version == "n3") {
             imgOn = eval(imgName + "on.src");
             document [imgName].src = imgOn;
             }
     }

     function img_inact(imgName) {
             if (version == "n3") {
             imgOff = eval(imgName + "off.src");
             document [imgName].src = imgOff;
             }
     }