function adjustHeader(){
    el = document.getElementById('tableHead');
    dataTop = document.getElementById('data').scrollTop;
    headCells = el.children[0].children;
  	 for(i=0;i<headCells.length; i++){
      headCells[i].style.top = dataTop-1;
    }
    row2 = el.children[1];
    if (row2 != undefined){
	    headCells2 = row2.children;
	  	for(i=0;i<headCells2.length; i++){
	      headCells2[i].style.top = dataTop-1;
	    }
    }
    return true;
  }