function moveblocks(_class){
  $("div.clear").remove();
  var arr=$(_class);

if (arr.length>0)
{
var left=arr[0].offsetLeft;
var curr=0;
for (i=0;i<arr.length ;i++ )
{
 if ((arr[i].offsetTop!=curr)&&(arr[i].offsetLeft!=left))
 {
  $(arr[i]).before("<div class='clear' style='clear:left'></div>");
 }
  curr=arr[i].offsetTop;
}
}
}