// BROWSER SNIFFER (Sniff out the good and bad browsers)
function Is() 
{
    var agent = navigator.userAgent.toLowerCase();
    this.major = parseInt(navigator.appVersion);
    this.minor = parseFloat(navigator.appVersion);
    this.ns  = ((agent.indexOf('mozilla')!=-1) && ((agent.indexOf('spoofer')==-1) && (agent.indexOf('compatible') == -1)));
    this.ns2 = (this.ns && (this.major == 2));
    this.ns3 = (this.ns && (this.major == 3));
    this.ns4b = (this.ns && (this.minor < 4.04));
    this.ns4 = (this.ns && (this.major == 4));
    this.ns6 = (this.ns && (agent.indexOf("netscape6")!= -1));
    this.ie = (agent.indexOf("msie") != -1);
    this.ie3 = (this.ie && (this.major == 2));
    this.ie4 = (this.ie && (this.major >= 4));
    this.ie5 = (this.ie && (agent.indexOf("5.")!= -1));
    this.ie6 = (this.ie && (agent.indexOf("6.")!= -1));
    this.op3 = (agent.indexOf("opera") != -1);
    this.win = (agent.indexOf("win")!=-1);
    this.win95 = (agent.indexOf("windows 95")!=-1);
    this.win98 = (agent.indexOf("windows 98")!=-1);
    this.winME = (agent.indexOf("windows 9x 4.9")!=-1);
    this.winNT = (agent.indexOf("windows nt")!=-1);
    this.win2000 = (agent.indexOf("windows nt 5.")!=-1);
    this.mac = (agent.indexOf("mac")!=-1);
    this.unix = (agent.indexOf("x11")!=-1);
}

var is = new Is();

//DOM switching
var doc;
var sty;
var htm;
if(is.ns4) 
{
    doc = "document[";
    sty = "]";
    htm = ".document"
} 
else if(is.ie4) 
{
    doc = "document.all[";
    sty = "].style";
    htm = ""
}
else if(is.ns6 || is.ie5 || is.ie6) 
{
    doc = "document.getElementByID(";
    sty = ").style";
    htm = ""
}