function clearText(field){
    if (field.defaultValue == field.value) field.value = '';
    else if (field.value == '') field.value = field.defaultValue;
}


<!--  functionen gallery start  -->
$(document).ready(function() {		
	
    //Execute the slideShow
    slideShow();

});

function slideShow() {

    //Set the opacity of all images to 0
    $('#gallery a').css({
        opacity: 0.0
    });
	
    //Get the first image and display it (set it to full opacity)
    $('#gallery a:first').css({ opacity: 1.0 });
	
/*	 //Animate the caption, opacity to 0.7 and heigth to 100px, a slide up effect
    $('#gallery .caption')
	.animate({ opacity: 0.7 },100 ).animate({ height: '25px' },500 );
	
*/	
	
	
    //Set the caption background to semi-transparent
    $('#gallery .caption').css({ opacity: 0.0 },0);

    //Resize the width of the caption according to the image width
    $('#gallery .caption').css({
        width: $('#gallery a').find('img').css('width')
        });
	
    //Get the caption of the first image from REL attribute and display it
    $('#gallery .content').html($('#gallery a:first').find('img').attr('rel'))
    .animate({
        opacity: 0.7
    }, 400);
	
    //Call the gallery function to run the slideshow, 6000 = change to next image after 6 seconds
    setInterval('gallery()',4000);
	
}

function gallery() {
	
    //if no IMGs have the show class, grab the first image
    var current = ($('#gallery a.show')?  $('#gallery a.show') : $('#gallery a:first'));

    //Get next image, if it reached the end of the slideshow, rotate it back to the first image
    var next = ((current.next().length) ? ((current.next().hasClass('caption'))? $('#gallery a:first') :current.next()) : $('#gallery a:first'));
	
    //Get next image caption
    var caption = next.find('img').attr('rel');
	
    //Set the fade in effect for the next image, show class has higher z-index
    next.css({
        opacity: 0.0
    })
    .addClass('show')
    .animate({
        opacity: 1.0
    }, 1000);

    //Hide the current image
    current.animate({
        opacity: 0.0
    }, 1000)
    .removeClass('show');
	
    //Set the opacity to 0 and height to 1px
    $('#gallery .caption').animate({
        opacity: 0.0
    }, {
        queue:false,
        duration:0
    }).animate({
        height: '100px'
    }, {
        queue:true,
        duration:300
    });
	
    //Animate the caption, opacity to 0.7 and heigth to 100px, a slide up effect
    $('#gallery .caption').animate({
        opacity: 0.7
    },100 ).animate({
        height: '25px'
    },500 );
	
    //Display the content
    $('#gallery .content').html(caption);

}

<!--  functionen gallery ende -->