window.onload = function() {
  var node_a = document.getElementsByTagName('a');
  for (var i in node_a) {
    if (node_a[i].className == 'blank') {
      node_a[i].onclick = function() {
        window.open(this.href, '', '');
        return false;
      };
    }
  }
};


function disp(url){ 

window.open(url, "window_name", "width=748,height=548,scrollbars=no"); 

}