/* This script and many more are available free online at
The JavaScript Source :: http://javascript.internet.com
Created by: Manzi Olivier :: http://www.imanzi.com/ */

// calculate the ASCII code of the given character
function CalcKeyCode(aChar) {
  var character = aChar.substring(0,1);
  var code = aChar.charCodeAt(0);
  return code;
}

function checkDomain(val) {
  var strPass = val.value;
  var strLength = strPass.length;
  var lchar = val.value.charAt((strLength) - 1);
  var cCode = CalcKeyCode(lchar);

  /* Check if the keyed in character is a number
     do you want alphabetic UPPERCASE only ?
     or lower case only just check their respective
     codes and replace the 48 and 57 */
//if((hh > 47 && hh<58) || (hh > 64 && hh<91) || (hh > 96 && hh<123) || hh==45) { } else 



if ( (strstr(strPass,'.') || strstr(strPass,' ')) || (cCode < 48 || cCode > 57) && (cCode < 97 || cCode > 122 ) && (cCode < 65 || cCode > 90 ) && (cCode != 45 && cCode != 95 )) 
{
	var myNumber = val.value.substring(0, (strLength) - 1);
	val.value = myNumber;
	alert('Letters, Numbers, Dash & Underscore Only!');
	val.value = '';
}
  return false;
}

function strstr(haystack, needle, bool) {
    // Finds first occurrence of a string within another  
    // 
    // version: 1003.2411
    // discuss at: http://phpjs.org/functions/strstr    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   bugfixed by: Onno Marsman
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // *     example 1: strstr('Kevin van Zonneveld', 'van');
    // *     returns 1: 'van Zonneveld'    // *     example 2: strstr('Kevin van Zonneveld', 'van', true);
    // *     returns 2: 'Kevin '
    // *     example 3: strstr('name@example.com', '@');
    // *     returns 3: '@example.com'
    // *     example 4: strstr('name@example.com', '@', true);    // *     returns 4: 'name'
    var pos = 0;
    
    haystack += '';
    pos = haystack.indexOf( needle );    if (pos == -1) {
        return false;
    } else{
        if (bool){
            return haystack.substr( 0, pos );        } else{
            return haystack.slice( pos );
        }
    }
}