function isNumberKey(evt)
{
var charCode = (evt.which != undefined) ? evt.which : evt.keyCode;
 if (charCode > 31 && (charCode < 48 || charCode > 57))
	return false;

 return true;
}

function isCharKey(evt)
{
var charCode = (evt.which != undefined) ? evt.which : evt.keyCode;
 if (charCode > 31 && (charCode < 65 || charCode > 90) &&  (charCode < 97 || charCode > 122))
	return false;

 return true;
}

function isEmailKey(evt)
{
var charCode = (evt.which != undefined) ? evt.which : evt.keyCode;
 if (charCode > 31 && (charCode < 45 || charCode > 46) && (charCode < 48 || charCode > 57) && (charCode < 64 || charCode > 90) && (charCode < 95 || charCode > 95) && (charCode < 97 || charCode > 122))
	return false;

 return true;
}