function table_horiz_ruler()
{
	var tables = document.getElementsByTagName('table');
	for (i = 0; i < tables.length; i++) {
		if (tables[i].className.match("horiz_ruler")) {
			var trs = tables[i].getElementsByTagName('tr');
			for(j = 0; j < trs.length; j++) {
				trs[j].onmouseover = function() { 
					this.oldClassName = this.className;
					this.className = this.className + ' tablecurrent'; 
					return false;
				}
				trs[j].onmouseout = function() { 
					this.className = this.oldClassName; 
					return false; 
				}
			}
		}
	}
}