$(function() {
        $(".head-pic .user-name").each(function() {
          var maxwidth = 4;
          if ($(this).text().length > maxwidth) {
            var b = $(this).children().is("a");
            if (b) {
              $(this).children().text($(this).children().text().substring(0, maxwidth) + "...");
            } else {
              $(this).text($(this).text().substring(0, maxwidth));
              $(this).text($(this).text() + "..");
            }
          }
        });
      });

overflow: hidden;
white-space:nowrap; 
text-overflow:ellipsis; // IE 
-o-text-overflow: ellipsis; //Opera
-icab-text-overflow: ellipsis; //iCab 
-khtml-text-overflow: ellipsis; //Konqueror Safari 
-moz-text-overflow: ellipsis; //Firefox,mozilla 
-webkit-text-overflow: ellipsis;  //Safari,Swift