.dialog-b {
 width:250px;
 margin:0px auto;
 max-width:150px; /* I only cut the left background images out to 800px. You could do much larger, etc. */
 color:#fff;
}

.dialog-b .hd-b .c-b,
.dialog-b .ft-b .c-b {
 font-size:1px; /* ensure minimum height */
 height:20px;
}

.dialog-b .ft-b .c-b {
 height:20px;
}

.dialog-b .hd-b {
 background:url(/_images/corner_blue/tl.png) no-repeat 0px 0px;
 margin-right:20px; /* space for right corner */
 margin-bottom:17px;
}

.dialog-b .hd-b .c-b {
 background:url(/_images/corner_blue/tr.png) no-repeat right 0px;
 margin-right:-20px; /* pull right corner back over "empty" space (from above margin) */
}

.dialog-b .bd-b {
 background:url(/_images/corner_blue/ml.png) repeat-y 0px 0px;
 margin-right:20px;
}

.dialog-b .bd-b .c-b {
 background:url(/_images/corner_blue/mr.png) repeat-y right 0px;
 margin-right:-20px;
 margin-bottom:-17px;
 margin-top:-17px;
}

.dialog-b .ft-b {
 background:url(/_images/corner_blue/bl.png) no-repeat 0px 0px;
 margin-right:20px;
 margin-top:17px;
}

.dialog-b .ft-b .c-b {
 background:url(/_images/corner_blue/br.png) no-repeat right 0px;
 margin-right:-20px;
}