function checkloginform ( form )
{
  var iChars = "!@#$%^~`&*()+=[]/';,{}|\"\\<>?";

  if (form.v_usrnam.value == "") {
                alert("Please enter your Username." );
                form.v_usrnam.focus();
                return false ;
                }

  //Check if fields contain special characters
  for (var i = 0; i < document.forms["nameform"].v_usrnam.value.length; i++) {
    if (iChars.indexOf(document.forms['nameform'].v_usrnam.value.charAt(i)) != -1) {
                alert( 'Warning: Special characters are not allowed.\n\rPlease re-type your username.' );
                form.v_usrnam.focus();
                return false;
                }
  }
                
  if (form.v_usrpas.value == "") {
                alert("Please enter your Password." );
                form.v_usrpas.focus();
                return false ;
                }

  for (var i = 0; i < document.forms["nameform"].v_usrpas.value.length; i++) {
    if (iChars.indexOf(document.forms['nameform'].v_usrpas.value.charAt(i)) != -1) {
                alert( 'Warning: Special characters are not allowed.\n\rPlease re-type your password.' );
                form.v_usrpas.focus();
                return false;
                }
  }

}