/**
 * validate that the value is formatted as an email address correctly
 *
 * this regex matches the majoriity of all email address.
 * example matches.
 * Matches:  [rick.jones@unit.army.mil], [john_doe@foobar.com], [foo99@foo.co.uk]  
 * Non-Matches:  [find_the_mistake.@foo.org], [.prefix.@some.net]
 *
 * _CF_checkURL mailto uses this same email regex - keep in sync.
 */
function _CF_checkEmail(object_value, required)
{
	//trim whitespace before we validate
    object_value = object_value.replace(/^\s+/,'').replace(/\s+$/,'');

    if( required )
    {
        if( object_value.length == 0 )
        {
			alert('email address is required');
            return false;
        }
    }else{
        if( object_value.length == 0 )
        {
            return true;
        }
    }


	//return _CF_checkregex(object_value, /^[\w-]+(?:\.[\w-]+)*@(?:[\w-]+\.)+[a-zA-Z]{2,7}$/);
	//return _CF_checkregex(object_value, /^[a-zA-Z_0-9-]+(?:\.[a-zA-Z_0-9-]+)*@(?:[a-zA-Z_0-9-]+\.)+[a-zA-Z]{2,7}$/);
	var w =  _CF_checkregex(object_value, /^[a-zA-Z_0-9-'\+~]+(\.[a-zA-Z_0-9-'\+~]+)*@([a-zA-Z_0-9-]+\.)+[a-zA-Z]{2,7}$/, required);
	if(!w)
		{
			alert(object_value +'\n is not a valid email address');
			return w;
		}
	return w;
	
}



function _CF_checkregex(object_value, regexPattern, required)
{
    if( required )
    {
        if( object_value.length == 0 )
        {
            return false;
        }
    }else{
        if( object_value.length == 0 )
        {
            return true;
        }
    }

	return regexPattern.test(object_value);
}