/**
 * marks all rows and selects its first checkbox inside the given element
 * the given element is usaly a table or a div containing the table or tables
 *
 * @param    container    DOM element
 */
function markAllRows( container_id ) {
	var rows = document.getElementById(container_id).getElementsByTagName('tr');
    var unique_id;
    var checkbox;

	for ( var i = 0; i < rows.length; i++ ) {

        checkbox = rows[i].getElementsByTagName( 'input' )[0];

        if ( checkbox && checkbox.type == 'checkbox' ) {
            if ( checkbox.disabled == false ) {
                checkbox.checked = true;
                }
            }
	}

	return false;
}

/**
 * marks all rows and selects its first checkbox inside the given element
 * the given element is usaly a table or a div containing the table or tables
 *
 * @param    container    DOM element
 */
function unMarkAllRows( container_id ) {
	var rows = document.getElementById(container_id).getElementsByTagName('tr');
    var unique_id;
    var checkbox;

	for ( var i = 0; i < rows.length; i++ ) {

        checkbox = rows[i].getElementsByTagName( 'input' )[0];

        if ( checkbox && checkbox.type == 'checkbox' ) {
            if ( checkbox.disabled == false ) {
                checkbox.checked = false;
                }
            }
	}

	return true;
}