var isNav;
var isIE;
if(parseInt(navigator.appVersion.charAt(0)) >=4){
	var isNav = (navigator.appName=="Netscape")? "N":"E";
	var isIE = (navigator.appName.indexOf("Microsoft" != -1))? "E":"N";
}

function emailCheck(fieldname){

var invalidaddress=new Array()
invalidaddress[0]=""
var testresults
var invalidcheck=0;
var str=fieldname.value
var filter=/^.+@.+\..{2,3}$/
  if (str != "") {
	if (filter.test(str)){
		var tempstring=str.split("@")
		tempstring=tempstring[1].split(".")
		for (i=0;i<invalidaddress.length;i++){
		if (tempstring[0]==invalidaddress[i])
			invalidcheck=1
		}
		if (invalidcheck!=1)
			testresults=true
		else{
			alert("Please enter valid email address");
			testresults=false
		}
	}
	else{
		alert("Please enter valid email address");
		testresults=false
		fieldname.focus();
	}
   return (testresults)
  }
else{
   return true;
}
}