function rowCollapse(tableId, tag){
	tbl = document.getElementById(tableId);
	var hide = (tbl.rows[1].style.display == "none") ? false : true;
	var len = tbl.rows.length;
	var vStyle = (hide) ? "none":"";
	for(i=1 ; i < len; i++) {
		 tbl.rows[i].style.display = vStyle;
	tbl.rows[0].cells["collapseSign"].innerHTML = (hide) ? "+" : "-";
	}
}