http://www.mybusinesspos.org/foros/cache/themes/theme3/images/mycleanblue/logo.png
div#cabecera h1 a#logo {
background: url(http://www.mybusinesspos.org/foros/cache/themes/theme3/images/mycleanblue/logo.png) no-repeat;
div#cabecera h1 a#logo {
background: url(/foros/images/mycleanblue/logo.png) no-repeat;