// JavaScript Document
String.prototype.trim = function () {
  var str = this.replace(/^\s\s*/, ''),
  ws = /\s/,
  i = str.length;
  while (ws.test(str.charAt(--i)));
  return str.slice(0, i + 1);
 };
 
 function testValue(obj, txt) {
   if (obj.value.trim() == "") {
   obj.value = txt;
   }
 }
 
  function testNonEmpty(obj, checkId) {
   obj.value = obj.value.trim();
   if (obj.value == null || obj.value == "") {
   error(checkId);
   } else {
   ok(checkId);
   }
  }
  
  var errors = new Object;
  function error(checkId) {
   errors[checkId] = true;
   document.getElementById(checkId + "Error").style.display = 'block';
   document.getElementById(checkId + "Checked").style.display = 'none';
  }
  
  function ok(checkId) {
   errors[checkId] = false;
   document.getElementById(checkId + "Error").style.display = 'none';
   document.getElementById(checkId + "Checked").style.display = 'block';
  }
  
  // see http://www.regular-expressions.info/email.html for details
  var emailFilter = new RegExp("^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$", "i");
  var firstEmail = "";
  function checkEmail(email) {
   return email == null ? false : emailFilter.test(email.trim());
  } 

  function testEmail(email, checkId) {
   email.value = email.value.trim();
   if (checkEmail(email.value)) {
   ok(checkId);
   firstEmail = email.value.trim();
   } else {
   error(checkId);
   }
  }
  
  function testSelection(sel, checkId) {
   if (sel.selectedIndex == 0) {
   error(checkId);
   } else {
   ok(checkId);
   }
  }
  
  // force validators to be called if any
  function runBlur(form) {
   for (var i=0; i < form.length; ++i) {
   try {
   var field = form.elements[i];
   field.focus();
   field.blur();
   } catch(err) {}
   }
  }
  
  function validateForm(form, requiredFieldsCount) {
   runBlur(form);
   var count = 0;
   for (var entry in errors) {
   ++count;
   if (errors[entry]) {
   alert("Please fix the errors before continuing!");
   return false;
   }
   }
   if (count != requiredFieldsCount) {
   alert("Please provide data in all required fields before continuing!");
   return false;
   }
   return true;
  }