<input id="btn1_0" type="button" value="☵" class="rsform-calendar-box btnCal rsform-calendar-button btn btn-default" onclick="RSFormPro.YUICalendar.showHideCalendar('cal1_0Container');">

<div id="cal1_0Container" style="clear: both; position: absolute; z-index: 9987;" class="yui-calcontainer single">
Calendar Here
</div>

jQuery(document).click(function(event) {
    if ( !jQuery(event.target).hasClass('yui-calcontainer')) {
         jQuery(".yui-calcontainer").hide();
    }
});