var BrowserOK = false;
var BrowserMSIE3 = false;
var ns4 = false;
var ie4 = false;

// Image object implemented in Netscape 3 and above
if ( (navigator.appName == "Netscape") && navigator.appVersion.substring(0,1) > 2 ) {
	BrowserOK = true;
	ns4 = true;
	}

// and MSIE 4 and above
else if ( navigator.appVersion.indexOf("MSIE") != -1 ) {
	BrowserMSIE3 = true;
	BrowserOK = false;
	if (navigator.appVersion.substring(0,1) > 3) {
		BrowserOK = true;
		ie4 = true;
		}
	}
// otherwise ignore image object
else BrowserOK = false;


// Standard Generic Mouseovers
function depress(target) {
if (BrowserOK){
	var but_light = "document." + target + ".src";
	var img_src = "images/" + target + "but_on.gif";
	eval(but_light + "= '" + img_src +"'");
	
	}
}
function raise(target) {
if (BrowserOK){
	var but_light = "document." + target + ".src";
	var img_src = "images/" + target + "but_off.gif";
	eval(but_light + "= '" + img_src +"'");
	
	}
}