function isEmpty(objTxt){
	if(objTxt.value.length == 0)
		return true;
	else
		return false;
}


function checkBrowser(){
	this.ver=navigator.appVersion
	this.dom=document.getElementById?1:0
	this.ie5=(this.ver.indexOf("MSIE 5")>-1 && this.dom)?1:0;
	this.ie4=(document.all && !this.dom)?1:0;
	this.ns5=(this.dom && parseInt(this.ver) >= 5) ?1:0;
	this.ns4=(document.layers && !this.dom)?1:0;
	this.bw=(this.ie5 || this.ie4 || this.ns4 || this.ns5)
	return this
}
bw=new checkBrowser()
function changeBc(obj,color){
  div=bw.dom?document.getElementById(obj).style:bw.ie4?document.all[obj].style:bw.ns4?document.layers[obj]:0;	
	if(bw.dom || bw.ie4) div.backgroundColor=color;
	else if(bw.ns4) div.bgColor=color;
}