// Function to detect browser type
function Is()
{
 agent  = navigator.userAgent.toLowerCase();
 this.major = parseInt(navigator.appVersion);
 this.minor = parseFloat(navigator.appVersion);
    
 // Netscape 7 will show as Netscape 6 ( this.ns6 )
 
 this.ns    = ((agent.indexOf('mozilla')   !=   -1) &&
              ((agent.indexOf('spoofer')   ==   -1) &&
              (agent.indexOf('compatible') ==   -1)));
                 
 this.ns2   = (this.ns && (this.major      ==    3));
 this.ns3   = (this.ns && (this.major      ==    3));
 this.ns4b  = (this.ns && (this.major      ==    4) &&
              (this.minor                  <= 4.03));
 this.ns4   = (this.ns && (this.major      >=    4));
 this.ns6   = (this.ns && (this.major     >=    5));
   
 this.ie    = (agent.indexOf("msie")       !=   -1);
   
 this.ie3   = (this.ie && (this.major      <     4));
 this.ie4   = (this.ie && (this.major      ==    4) &&
              (agent.indexOf("msie 5.0")   ==   -1));
 this.ie4   = (this.ie && (this.major      ==    4) &&
			  (agent.indexOf("msie 5.0")   ==   -1) &&
              (agent.indexOf("msie 5.5")   ==   -1) &&
			  (agent.indexOf("msie 6.0")   ==   -1));
 this.ie5   = (this.ie && (this.major      ==    4) &&
              (agent.indexOf("msie 5.0")   !=   -1));
 this.ie55  = (this.ie && (this.major      ==    4) &&
              (agent.indexOf("msie 5.5")   !=   -1));
 this.ie6 =   (this.ie && (this.major      ==    4) &&
              (agent.indexOf("msie 6.0")   !=   -1));
} 

// declare an object of this type
var is = new Is();