var uagent,uappVersion,uappName
uappName=navigator.appName
uappVersion=navigator.appVersion
uagent=navigator.userAgent

if ((uagent.substring(25,29) == "MSIE" && uagent.charAt(30) > 3) || (uappName == "Netscape" && uappVersion.substring(0,3) > 3))

{

img1off= new Image;
img1off.src="images/nav/nav_home.jpg";
img2off= new Image;
img2off.src="images/nav/nav_about.jpg";
img3off= new Image;
img3off.src="images/nav/nav_board.jpg";
img4off= new Image;
img4off.src="images/nav/nav_contact.jpg";


img1on= new Image;
img1on.src="images/nav/nav_home2.jpg";
img2on= new Image;
img2on.src="images/nav/nav_about2.jpg";
img3on= new Image;
img3on.src="images/nav/nav_board2.jpg";
img4on= new Image;
img4on.src="images/nav/nav_contact2.jpg";


}

function active(imgName){

if ((uagent.substring(25,29) == "MSIE" && uagent.charAt(30) > 3) || (uappName == "Netscape" && uappVersion.substring(0,3) > 3)){

document[imgName].src = eval(imgName + "on.src");

}
}

function inActive(imgName){

if ((uagent.substring(25,29) == "MSIE" && uagent.charAt(30) > 3) || (uappName == "Netscape" && uappVersion.substring(0,3) > 3)){

document[imgName].src = eval(imgName + "off.src");

}
}