function op(id) {
document.getElementById('x'+id).innerHTML+='<span class="c1" id="y'+id+'"><span class="c2"><a href="#" onclick="javascript:return cl(\''+id+'\');"><img src="img/gallery/img_'+id+'.jpg" alt="Gallery Image" /></a></span></span>';
return false;
}

function cl(id) {
var ee=document.getElementById("y"+id);
ee.parentNode.removeChild(ee);
return false;
}