function echeck(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("Please Check E-Mail Address")
		return false
		}
	var user=matchArray[1]
	var domain=matchArray[2]
	if (user.match(userPat)==null) 
		{
		alert("The username doesn't seem to be valid.")
	    return false
		}
	var IPArray=domain.match(ipDomainPat)
	if (IPArray!=null)
		{
    // this is an IP address
		for (var i=1;i<=4;i++) 
			{
			if (IPArray[i]>255)
				{
				alert("Destination IP address is invalid!")
				return false
				}
			}
		return true
		}
	// Domain is symbolic name
	var domainArray=domain.match(domainPat)
	if (domainArray==null) 
		{
		alert("The 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>3) 
		{
		// the address must end in a two letter or three letter word.
		alert("The address must end in a three-letter domain, or two letter country.")
		return false
		}
	// Make sure there's a host name preceding the domain.
	if (len<2) 
		{
		var errStr="This address is missing a hostname!"
		alert(errStr)
		return false
		}

	// If we've gotten this far, everything's valid!
	return true;


}



function trim(inputString) {
   if (typeof inputString != "string") { return inputString; }
   var retValue = inputString;
   var ch = retValue.substring(0, 1);
   while (ch == " ") {
      retValue = retValue.substring(1, retValue.length);
      ch = retValue.substring(0, 1);
   }
   ch = retValue.substring(retValue.length-1, retValue.length);
   while (ch == " ") {
      retValue = retValue.substring(0, retValue.length-1);
      ch = retValue.substring(retValue.length-1, retValue.length);
   }
   while (retValue.indexOf("  ") != -1) {
      retValue = retValue.substring(0, retValue.indexOf("  ")) + retValue.substring(retValue.indexOf("  ")+1, retValue.length);
   }
   return retValue;
}

function isDigit (c)
{
		 return ((c >= "0") && (c <= "9"))
}

function isInteger(iNumber)
{
	var i;
	
	for (i=0;i<iNumber.length;i++)
	{
		var c = iNumber.charAt(i);
	
		if (!isDigit(c))
		{
			return false;
		}
	}
	
  	return true;
}