function checkBrowser()
{
this.platform = navigator.platform;
this.dom = (document.getElementById)? true : false;
this.op = (window.opera)? true : false;
this.op5 = (this.op && this.dom)? true : false;
this.ns = (window.outerWidth && !this.op)? true : false;
this.ns6 = (this.ns && this.dom)? true : false;
this.ns4 = (this.ns && !this.dom)? true : false;
this.ie = (document.all && !this.op)? true : false;
this.ie5 = (this.ie && this.dom)? true : false;
this.ie4 = (this.ei && !this.dom)? true : false;
}

var browser = new checkBrowser();