function noNumbers(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)
}
function noLetters(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 = /[^A-Za-z]/
return numcheck.test(keychar)
}
 function selectText(obj)
 {   
 obj.select();
 return false;
 }
 function clearText(obj)
 {
 obj.value='';
 return false;
 }
function emailLetters(e)
{
var keynum
var keychar
var numcheck
if(window.event)
{
keynum = e.keyCode
}
else if(e.which)
{
keynum = e.which
}
keychar = String.fromCharCode(keynum)
numcheck = /[a-zA-Z0-9.\_\-@\;]/
if(!numcheck.test(keychar))
{
if(keynum==8 ||keynum ==37||keynum ==38 || keynum ==39 || keynum ==40 || keynum ==46 || keynum == 190 ||keynum == 188)
return keychar
else return false
}
else
return numcheck.test(keychar)
}