function distinguiRighe(){
	var tables=document.getElementsByTagName("table");
	for(i=0;i<tables.length;i++) {
		if(tables[i].className.indexOf("alternarighe")>=0) {
			trs=tables[i].tBodies[0].rows;
			for(j=1;j<trs.length;j+=2) {
				trs[j].className="alternar";
				tds=trs[j].cells;
				for(k=0;k<tds.length;k++) {
					tds[k].className="alternac";
				}
			}
		}
	}
}