User:Aude/common.js

function validateAmount(amount){
        if(amount.value.match( /^[0-9]+(\.([0-9]+))?$/)){
                return true;
        }else{
                alert('You must enter a valid donation.');
                amount.focus();
                return false;
        }
}

if ( ( mw.config.get('wgPageName') == 'Home' ) && ( wgNamespaceNumber == 0 ) ) {
  $('#donatebutton').css({'border' : 'solid 1px red'});
  $('#donatebutton').html('<form action="https://checkout.google.com/cws/v2/Donations/334897480085960/checkoutForm" id="BB_BuyButtonForm" method="post" name="BB_BuyButtonForm" onSubmit="return validateAmount(this.item_price_1)" target="_top">
    <input name="item_name_1" type="hidden" value="Wiki Society of Washington, DC"/>
    <input name="item_description_1" type="hidden" value="Support DC region Wikimedia volunteers"/>
    <input name="item_quantity_1" type="hidden" value="1"/>
    <input name="item_currency_1" type="hidden" value="USD"/>
    <input name="item_is_modifiable_1" type="hidden" value="true"/>
    <input name="item_min_price_1" type="hidden" value="0.01"/>
    <input name="item_max_price_1" type="hidden" value="25000.0"/>
    <input name="_charset_" type="hidden" value="utf-8"/>
</form>
');
}