var is ; 
var isIE3Mac = false ; 
if ((navigator.appVersion.indexOf("Mac")!=-1) && (navigator.userAgent.indexOf("MSIE")!=-1) && (parseInt(navigator.appVersion)==3)) { 
		isIE3Mac = true ; } 
else { 
	is = new Is(); 
	} 

function Is() { 
var agt=navigator.userAgent.toLowerCase() 
this.major = parseInt(navigator.appVersion) 
this.nav = ((agt.indexOf('mozilla')!=-1) && ((agt.indexOf('spoofer')==-1) && (agt.indexOf('compatible') == -1))) 
this.nav4up = this.nav && (this.major >= 4) 
this.ie = (agt.indexOf("msie") != -1) 
this.ie4up = this.ie && (this.major >= 4) 
}

function is4orGreater() { 
if (!isIE3Mac && (is.nav4up || is.ie4up)) { 
	return true ; 
	} 
else { 
	return false ; 
	} 
} 

// alert('Load browser.js');