function changeImg(src, counter)
{
  /*
  if(navigator.appName == "Microsoft Internet Explorer")
	{
		//alert(navigator.appName);blendTrans(duration=1):
		document['main_image'].style.filter='blendTrans(Duration=0.5)';
		document['main_image'].filters[0].Apply();
		document['main_image'].filters[0].Play();
	}
	*/
	document.getElementById("main_image").src=src;
	for (var x = 1; x <= 17; x++)
  {
    document.getElementById("thumb_"+x).className = 'opac_on';
  }
  document.getElementById("thumb_"+counter).className = 'opac_off';

	//document['main_image'].src=src;
	return;
}

function checkForm(objForm)
{
  var arClass, bValid;
  var objField = objForm.getElementsByTagName('*');

  for (var iFieldCounter=0; iFieldCounter<objField.length; iFieldCounter++)
  {
    arClass = objField[iFieldCounter].className.split(' ');
    for (var iClassCounter=0; iClassCounter<arClass.length; iClassCounter++)
    {
      //alert(arClass[iClassCounter]);
      switch (arClass[iClassCounter])
      {
        case 'string':
           bValid = isString(objField[iFieldCounter].value.replace(/^\s*|\s*$/g, ''));
           break;
        case 'number' :
           bValid = isNumber(objField[iFieldCounter].value);
           break;
        case 'email' :
           bValid = isEmail(objField[iFieldCounter].value);
           break;
        case 'telephone' :
           bValid = isTelephone(objField[iFieldCounter].value);
           break;
        case 'password' :
           bValid = isPassword(objField[iFieldCounter].value);
           break;
        default:
           bValid = true;
      }

      if (bValid == false)
      {
        s = new String(objField[iFieldCounter].name);
        s = s.replace(/_/g," ");

        alert('Please review the value you entered for ' + s);
        objField[iFieldCounter].select();
        objField[iFieldCounter].focus();
        return false;
      }
    }
  }
  return true;
}

function isString(strValue)
{
  return (typeof strValue == 'string' && strValue != '' && isNaN(strValue));
}

function isNumber(strValue)
{
  return (!isNaN(strValue) && strValue != '');
}


function isEmail(strValue)
{
  var objRE = /^[\w-\.\']{1,}\@([\da-zA-Z-]{1,}\.){1,}[\da-zA-Z-]{2,}$/;

  return (strValue != '' && objRE.test(strValue));
}

function isTelephone(strValue)
{
  return (strValue != '');
}

function isPassword(strValue)
{
  return (strValue != '');
}