function IsEmail(string, obj, msgstr)
	{
		if(string.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) != -1)
			return true;
		else
		{
			alert(msgstr);
			obj.focus();
			return false;
		}
	}

function isEmpty(str){
  return (str == null) || (str.length == 0);
}

// returns true if the string only contains characters A-Z or a-z
function isAlpha(str){
  var re = /[^a-zA-Z]\ /g
  if (re.test(str)) return false;
  return true;
}

function isNumeric(str){
  var re = /[\D]/g
  if (re.test(str)) return false;
  return true;
}


function alpha(e) {
var k;
document.all ? k = e.keyCode : k = e.which;
return ((k > 64 && k < 91) || (k > 96 && k < 123) || k == 8 || (k > 8 && k<10) || k == 32);
}