// Validate the browser is compatable for javascript
var browser = false;

// Detect IE4+
version = 0;
if (navigator.appVersion.indexOf("MSIE") != -1) {
   temp=navigator.appVersion.split("MSIE");
   version=parseFloat(temp[1]);
}
if (version >= 4) browser = true;

// Detect Firefox 1+
if(navigator.userAgent.indexOf("Firefox")!=-1) {
	var versionindex=navigator.userAgent.indexOf("Firefox")+8;
	if (parseInt(navigator.userAgent.charAt(versionindex))>=1);
	browser = true;
}

// Detect Netscape 4.7+
if (navigator.appName=="Netscape"&&parseFloat(navigator.appVersion)>=4.7) {
   browser = true;
}