window.onload = initAll;

function initAll(){

    var panelLeftHight = document.getElementById('secondConL').offsetHeight;
    var panleRightHight = document.getElementById('secondConR').offsetHeight;
   
    if(panelLeftHight >panleRightHight ){
        var org = document.getElementById('BoxShadowCon_M').offsetHeight;
        document.getElementById('BoxShadowCon_M').style.height = (org+(panelLeftHight-panleRightHight))+"px";
     
    }
}