function is_alt(field){
	if(field.value == field.alt)
		field.value = "";
}

function is_empty(field){
	if(field.value == "")
		field.value = field.alt;
}

function thumbOver(thumb){
	title = thumb.getElementsByClassName('title');
	if(title[0].getStyle('display') == 'none'){
		new Effect.SlideDown(title[0]);
	}
}

function thumbOut(thumb){
	title = thumb.getElementsByClassName('title');
	if(title[0].getStyle('display') != 'none'){
		new Effect.SlideUp(title[0]);
	}
}