function initTable(table)
{
    var tds = table.getElementsByTagName('TR');
    var tds_cnt = tds.length;
    
    for(var i=1; i<tds_cnt; i++)
    {
        if (!(i%2))
        {
            tds[i].bgColor='#ffffff';
        }
        
        tds[i].onmouseover = function(){
            this.className='sel_row'; 
        }
        
        tds[i].onmouseout = function(){
            this.className=''; 
        }
        
    }
}

        window.onload = function(){
            
            var tbl_list = getElementsByClass('table_data');
            
            var cnt = tbl_list.length
            for (var i=0;i<cnt;i++)
            {
                initTable(tbl_list[i]);
            }
        }
         function getElementsByClass(classname, node) {
          if(!node) node = document.getElementsByTagName("body")[0];
          var a = [];
          var re = new RegExp('\\b' + classname + '\\b');
          var els = node.getElementsByTagName("*");
          for(var i=0,j=els.length; i<j; i++)
          if(re.test(els[i].className))a.push(els[i]);
          return a;
      }