/*
*	Watermark plugin
*	Version: 0.6
*	jQuery 1.2.6
*	 
*	Author: Gonzalo Villar
*
*	TODO:
*		- Inherit all the watermarked element CSS
* 
*/
(function($) {

    function CreateDummyInput(jElement, options, tagName) {
        var watermarkText = (options.watermarkText) ? options.watermarkText : jElement.attr('title');
        var dummyType = (tagName == 'INPUT') ? '<input type="text">' : '<textarea>';
        var dummyInput = $(dummyType)
            .attr('id', jElement.attr('id') + '_watermark')
            .addClass(options.watermarkCssClass)
			.addClass('watermarkPluginCustomClass') //workaround to fix some caching? problem in FF3. Used in window.unload hook to remove watermarks from the DOM
            .val(watermarkText)
			.css({ overflowY: jElement.css('overflow-y'), overflowX: jElement.css('overflow-x') });

        if (jElement.height() > 0)
            dummyInput.css({ height: jElement.outerHeight(), width: jElement.outerWidth() });

        dummyInput.hide();
        jElement.before(dummyInput);
        return dummyInput;
    }

    function MakeWatermark(element, options) {
        element.each(function() {
            var thisEl = jQuery(this);

            var dummyInput = CreateDummyInput(thisEl, options, thisEl.attr('tagName').toUpperCase());

            dummyInput.focus(function(e) {
                $(this).hide();
                thisEl.show().focus();
            });

            thisEl.blur(function(e) {
                if (this.value == '') {
                    $(this).hide();
                    dummyInput.show();
                }
            });

            thisEl.blur();

        });

        return element;
    }

    $(window).unload(function() {
        $('.watermarkPluginCustomClass').remove();
    });

    $.fn.watermark = function(options) { return MakeWatermark(this, options); }

})(jQuery);