.md_5390{ width:100%;min-width:830px;overflow:hidden;}
.md_5390 img{ max-width:100%;}

.md_5390 .md_cont{ width:100%; min-height:310px; padding:10px; position:relative;}
.md_5390 .md_cont .md_picbox{width:450px; height:300px; position:absolute; left:50%; top:50%; overflow:hidden; margin-left:-230px; margin-top:-150px; text-align:center; z-index:1; border:5px solid #ddd;}
.md_5390 .md_cont .md_picbox .md_imgalt_bg{ font-size:16px; position:absolute; left:0; bottom:0; width:100%; height:2em; background:#333; opacity:0.5;filter: alpha(opacity=50);}
.md_5390 .md_cont .md_picbox .md_imgalt{ font-size:16px; color:#fff; position:absolute; left:0; bottom:0; width:100%; line-height:2em; text-align:center;}
.md_5390 .md_cont .md_picbox .md_imgalt a{ font-size:16px; color:#fff;}
.md_5390 .md_cont .md_picbox .md_imgalt a:hover{ color:#f90;}