function whichBrs() {
			var agt=navigator.userAgent.toLowerCase();
			if (agt.indexOf("opera") != -1) return 'Opera';
			if (agt.indexOf("staroffice") != -1) return 'Star Office';
			if (agt.indexOf("webtv") != -1) return 'WebTV';
			if (agt.indexOf("beonex") != -1) return 'Beonex';
			if (agt.indexOf("chimera") != -1) return 'Chimera';
			if (agt.indexOf("netpositive") != -1) return 'NetPositive';
			if (agt.indexOf("phoenix") != -1) return 'Phoenix';
			if (agt.indexOf("firefox") != -1) return 'Firefox';
			if (agt.indexOf("safari") != -1) return 'Safari';
			if (agt.indexOf("skipstone") != -1) return 'SkipStone';
			if (agt.indexOf("msie") != -1) return 'Internet Explorer';
			if (agt.indexOf("netscape") != -1) return 'Netscape';
			if (agt.indexOf("mozilla/5.0") != -1) return 'Mozilla';
			if (agt.indexOf('\/') != -1) {
			if (agt.substr(0,agt.indexOf('\/')) != 'mozilla') {
			return navigator.userAgent.substr(0,agt.indexOf('\/'));}
			else return 'Netscape';} else if (agt.indexOf(' ') != -1)
			return navigator.userAgent.substr(0,agt.indexOf(' '));
			else return navigator.userAgent;
		}
		
		function hideAppropriateDiv(){
			var browserName = whichBrs();
			var msgDiv = document.getElementById('closeMsg');
			var buttonDiv = document.getElementById('closeButton');
			
			if(browserName == 'Firefox' || browserName == 'Mozilla'){
				buttonDiv.style.visibility = "hidden";
				msgDiv.style.visibility = "visible";
			} else {
				buttonDiv.style.visibility = "visible";
				msgDiv.style.visibility = "hidden";
			}
		}