// JavaScript Document
function isEmpty(s)
{   return ((s == null) || (s.length == 0))
}
// Returns true if string s is empty or 
// whitespace characters only.
var reWhitespace = /^\s+$/
var reEmail = /^.+\@.+\..+$/

function isWhitespace (s)

{   // Is s empty?
    return (isEmpty(s) || reWhitespace.test(s));
}

function isEmail (s)

{   if (isEmpty(s)) 
       if (isEmail.arguments.length == 1) return defaultEmptyOK;
       else return (isEmail.arguments[1] == true);
    
    else {
       return reEmail.test(s)
    }
}

function checkNumeric(e) 
		{
		
		var keynum
		var keychar
		var numcheck
		
		if(window.event) // IE
		{
			keynum = e.keyCode
		}
		else if(e.which) // Netscape/Firefox/Opera
		{
			keynum = e.which
		}
		
		keychar = String.fromCharCode(keynum)
		
		
		numcheck = /\d/
		return numcheck.test(keychar)
		
		/*if (field.value.length > maxlimit) // if too long...trim it!
		field.value = field.value.substring(0, maxlimit);
		// otherwise, update 'characters left' counter
		else
		cntfield.value = maxlimit - field.value.length;*/
		}
		
		
		function echeck(str) {

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail ID")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail ID")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

 		 return true					
	}