function blockElement(elementSelector)
{
     $(elementSelector).block
     ({
        message: '<div><img src="../images/ajax-loader.gif"/></div>',  
        css: {border:'0px','background-color':'transparent'},
        overlayCSS: {opacity:0.04,cursor:'pointer'}
      });
 }

function unblockElement(elementSelector)
{
    $(elementSelector).unblock();
}