function trim(text)
{
	var str=text;
	var ln=str.length;
	if (ln==0){return str;}
	while(str.charAt(0)==" ")
	{
		str=str.substr(1);
	}
	ln=str.length;
	while(str.charAt(ln-1)==" ")
	{
		str=str.substring(0,ln-1);
		ln=str.length;
	}
	return str;
}

function chkspaces(chkStr,fieldname)
{
	if (chkStr.indexOf(" ")>=0)
	{
		alert("The "+fieldname+" has spaces in it.");
		return false;
	}
	else
	{
		return true;
	}
}

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("Email address seems incorrect (check @ and .'s)")
	return false
}
var user=matchArray[1]
var domain=matchArray[2]
if (user.match(userPat)==null) {
    alert("The username on email doesn't seem to be valid.")
    return false
}
var IPArray=domain.match(ipDomainPat)
if (IPArray!=null) {
	  for (var i=1;i<=4;i++) {
	    if (IPArray[i]>255) {
	        alert("Email IP address is invalid!")
		return false
	    }
    }
    return true
}
var domainArray=domain.match(domainPat)
if (domainArray==null) {
	alert("Email domain name doesn't seem to be valid.")
    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>4) {
   alert("Email address must end in a 3-4 letter domain, or two letter country.")
   return false
}
if (len<2) {
   var errStr="Email address is missing a hostname!"
   alert(errStr)
   return false
}
return true;
}