function checkBrowser(browserType,browserVersion){
	if (browserVersion==null||browserVersion==""||browserVersion==undefined||browserVersion=='undefined') browserVersion=0;
	var is_ie=false;
	var is_nn=false;
	var is_ff=false;
	var appVer=navigator.appVersion.toLowerCase();
	var agt=navigator.userAgent.toLowerCase();
	var minorVersion=parseFloat(appVer);
	var iePos=appVer.indexOf("msie");
	var is_ie=(iePos!=-1);
	var is_ff=(agt.indexOf("firefox")!=-1&&!is_ie);
	var is_nn=(agt.indexOf("mozilla")!=-1&&!is_ie&&!is_ff);
	var is_safari = ((agt.indexOf('safari')!=-1)&&(agt.indexOf('mac')!=-1))?true:false;
	if (is_ie) minorVersion=parseFloat(appVer.substring(iePos+5,appVer.indexOf(";",iePos)));
	else if (is_ff||is_nn) {
		var minorVersion=(navigator.vendorSub)?navigator.vendorSub:0;
		if(!minorVersion){
			minorVersion=agt.indexOf('rv:');
			minorVersion=agt.substring(minorVersion+3);
			is_paren = minorVersion.indexOf(')');
			minorVersion=minorVersion.substring(0,is_paren);
		}
		minorVersion=parseFloat(minorVersion);
	}
	if ((navigator.vendor)&&((navigator.vendor=="netscape6")||(navigator.vendor=="netscape"))&&(is_nn)) minorVersion=parseFloat(navigator.vendorSub);
	if (browserType.toUpperCase()=="IE"){
		if (is_ie&&minorVersion>=browserVersion) return true;
		else return false;
	}else if (browserType.toUpperCase()=="FF"){
		if (is_ff&&minorVersion>=browserVersion) return true;
		else return false;
	}else if (browserType.toUpperCase()=="NN"){
		if (is_nn&&minorVersion>=browserVersion) return true;
		else return false;
	}else if (browserType.toUpperCase()=="SF"){
		return true;
	}else{
		return false;
	}
}