function tableRows( start ) {
	if( document.getElementsByTagName ) {
		var tables = document.getElementsByTagName( 'table' );
		for( var i = start; i < tables.length; i++ ) {
			var trs = tables[i].getElementsByTagName( 'tr' );
			for( var j = 1; j < trs.length; j += 2 ) {
				trs[j].className = 'rowshade';
			}
		}
	}
}