Browser specific javascript coding

Hi Web developers,
You might have encountered some situations where we have to code something based on the browser where it is rendering.Here is a small utility javascript to return the browser version.So that we can code according to the version of browser.

Code

<script language="javascript" type="text/javascript">

function browser()
{
this.ver=navigator.appVersion
this.agent=navigator.userAgent
this.dom=document.getElementById?1:0
this.opera5=this.agent.indexOf("Opera 5")>-1
this.ie5=(this.ver.indexOf("MSIE 5")>-1 && this.dom && !this.opera5)?1:0;
this.ie6=(this.ver.indexOf("MSIE 6")>-1 && this.dom && !this.opera5)?1:0;
this.ie7=(this.ver.indexOf("MSIE 7")>-1 && this.dom && !this.opera5)?1:0;
this.ie4=(document.all && !this.dom && !this.opera5)?1:0;
this.ie=this.ie4||this.ie5||this.ie6||this.ie7
this.mac=this.agent.indexOf("Mac")>-1
this.ns6=(this.dom && parseInt(this.ver) >= 5) ?1:0;
this.ns4=(document.layers && !this.dom)?1:0;
this.bw=(this.ie7 || this.ie6 || this.ie5 || this.ie4 || this.ns4 || this.ns6 || this.opera5)
return this
}
var bw=new browser();
</script>

Usage

<script language="javascript" type="text/javascript">

function clicked()
{
if(bw.ie)
{
alert("Code for ie7");
}
else
{
alert("Code for another browser");
}
}
</script>