Grau blockiert mein hintergrundbild

<style type="text/css">
<!--
td.edit_navi_headbg{background-image: url(URL);background-color: transparent;}
td.edit_below_nav{visibility: hidden;}
td.edit_rechts_sbg{background-image: url(URL);visibility: hidden;position: absolute;right: 0px;}
td.edit_rb_footer{visibility: hidden;}
td.edit_rechts_bottom{background-image: url(URL);background-color: transparent;}
td.edit_rechts_cbg{background-image: url(URL);background-color: transparent;}
-->
</style>