var browser=navigator.appName
var b_version=navigator.appVersion
var version=parseFloat(b_version)

if ((browser=="Microsoft Internet Explorer") && (version>=4) && (version < 7) 
{
	document.getElementById('stylesheetname').href="styleIE.css"
} 
else if(browser=="Netscape")
{
	document.getElementById('stylesheetname').href="styleNS.css"
}