function paintZebra()
{
if (document.getElementsByTagName)
	{
	tables = document.getElementsByTagName("table");
    	for(j=0; j<tables.length; j++)
		{
      		if (tables[j].className.indexOf('zebra') > -1) // if the classname includes 'zebra'
      			{
      			for (k=0; k<tables[j].rows.length; k=k+2)
        			{
          				tables[j].rows[k].className='even';
        			}
      			}
    		}
  	}
}