Leonid

<div data-role="panel" id="left-panel" data-display="overlay" data-position-fixed="true"></div>

.ui-panel.ui-panel-open {
    position:fixed;
}
.ui-panel-inner {
    position: absolute;
    top: 1px;
    left: 0;
    right: 0;
    bottom: 0px;
    overflow: scroll;
    -webkit-overflow-scrolling: touch;
}
.ui-page-active.ui-page-panel {
height: 70%;
}