var tl_pair = "pair" ;
var tl_impair = "impair" ;


function tl_init() {
	var ti, tbls, bodies, bi, pair, ri ;
	if (!document.getElementsByTagName) return;
    tbls = document.getElementsByTagName("table");
    for (ti=0;ti<tbls.length;ti++) {
    	if (!hasClass(tbls[ti], 'presentation')) {
			pair = true ;
			for(bi=0;bi<tbls[ti].tBodies.length;bi++) {
				for(ri=0;ri<tbls[ti].tBodies[bi].rows.length;ri++) {
					if (pair) {
						addClass(tbls[ti].tBodies[bi].rows[ri], tl_pair) ;
						pair = false ;
					} else {
						addClass(tbls[ti].tBodies[bi].rows[ri], tl_impair) ;
						pair = true ;
					}
				}
			}
		}
    }
}

addEvent(window, "load", tl_init);