function checkBrowser(){
	this.ver=navigator.appVersion
	this.dom=document.getElementById?1:0
	this.ie7=(this.ver.indexOf("MSIE 7")>-1 && this.dom)?1:0;
	this.ie6=(this.ver.indexOf("MSIE 6")>-1 && this.dom)?1:0;
	this.ie5=(this.ver.indexOf("MSIE 5")>-1 && this.dom)?1:0;
	this.ie4=(document.all && !this.dom)?1:0;
	this.ns7=(this.dom && parseInt(this.ver) >= 7) ?1:0;
	this.ns6=(this.dom && parseInt(this.ver) >= 6) ?1:0;
	this.ns5=(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.ns5 || this.ns6 || this. ns7)
	return this
}