/*
* Copyright (c) 2006, Gavin van Lelyveld 
* All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
*     * Redistributions of source code must retain the above copyright
*       notice, this list of conditions and the following disclaimer.
*     * Redistributions in binary form must reproduce the above copyright
*       notice, this list of conditions and the following disclaimer in the
*       documentation and/or other materials provided with the distribution.
*     * Neither the name of the organisation nor the
*       names of its contributors may be used to endorse or promote products
*       derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
function check_email(test_address)
{
    var l, df, af, ret, ac;ret=false;df=0;af=0;ac=0;l=test_address.length;
     if (test_address.search('^[\\w-_\.]*[\\w-_\.]\@[\\w]\.+[\\w]+[\\w]$') == -1){return false;}
     do {if ((l < test_address.length)&&(l>=1)&&(test_address.substr(l,1)==".")) {df=l;}if ((l < test_address.length)&&(l>=1)&&(test_address.substr(l,1)=="@")&&(df > l+1)) {ret=true;af=l;ac=ac+1;}l=l-1;} while (l >= 0);
     if (ret==false){return false;}if (ac > 1) {return false;}if (test_address.substr(test_address.length,1)=="."){return false;}
     return ret;
}
function find(element_id) { return document.getElementById(element_id); }

function validate_text(field_name, message)
{
    field_to_check = find(field_name);if (field_to_check)
    {
        if (field_to_check.value == "")
        {
            alert(message); field_to_check.focus(); return false;
        }
    }
    else
    {
        alert(field_name + " not found");return false;
    }
return true;
}
function validate_email(field_name, message)
{
    field_to_check = find(field_name);if (field_to_check)
    {
        if (field_to_check.value == "" || !check_email(field_to_check.value))
        {
            alert(message); field_to_check.focus(); return false;
        }
    }
    else
    {
        alert(field_name + " not found");return false;
    }
return true;
}