function js_check_poll(param_obj) {
	var str_return = "";
	
	if (document.mfdrpoll.easeofuse[0].checked == false && document.mfdrpoll.easeofuse[1].checked == false) {
		str_return = str_return + "\n1. The website is easy to use: Yes | No";
	}
	if (document.mfdrpoll.usefulness[0].checked == false && document.mfdrpoll.usefulness[1].checked == false) {
		str_return = str_return + "\n2. The website gives useful information: Yes | No";
	}
	if (document.mfdrpoll.frequency[0].checked == false && document.mfdrpoll.frequency[1].checked == false && document.mfdrpoll.frequency[2].checked == false) {
		str_return = str_return + "\n3. The website I visit the site: regularly | occasionally | this is my first visit";
	}
	
	
	
	if (str_return != "") {
		alert("Please supply your response to the following questions:\n" + str_return);
	}
	else {
		return true;
	}
	
	return false;
}

function emailCheck (emailStr) {
var emailPat=/^(.+)@(.+)$/
var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
var validChars="\[^\\s" + specialChars + "\]"
var quotedUser="(\"[^\"]*\")"
var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
var atom=validChars + '+'
var word="(" + atom + "|" + quotedUser + ")"
var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")
var matchArray=emailStr.match(emailPat)
if (matchArray==null) {
 	alert("Invalid email format")
	return false
}
var user=matchArray[1]
var domain=matchArray[2]
if (user.match(userPat)==null) {
alert("Invalid email format.")
    return false
}


var IPArray=domain.match(ipDomainPat)
if (IPArray!=null) {
  
	  for (var i=1;i<=4;i++) {
	    if (IPArray[i]>255) {
	        alert("Invalid email format")
		return false
	    }
    }
    return true
}


var domainArray=domain.match(domainPat)
if (domainArray==null) {
	alert("Invalid email format")
    return false
}


var atomPat=new RegExp(atom,"g")
var domArr=domain.match(atomPat)
var len=domArr.length
if (domArr[domArr.length-1].length<2 || 
    domArr[domArr.length-1].length>3) {
  
   alert("Invalid email format")
   return false
}


if (len<2) {
   var errStr="Invalid email format"
   alert(errStr)
   return false
}
return true;
}