function toggle_menu(idMenuItem){
		
		// get the child box
		var oBoxChild=$('sub_menu_' + idMenuItem);
		var oImgMarker=$('img_mark_' + idMenuItem);
		
		// Unfold the branch if it isn't visible
		if (oBoxChild.style.display == 'none'){
			// Change the image (if there is an image)
			oImgMarker.className='child_block';
			oBoxChild.style.display = 'block';
		}
		// Collapse the branch if it IS visible
		else
		{
			// Change the image (if there is an image)
			oImgMarker.className='child_none';
			oBoxChild.style.display = 'none';
		}
		return false;
	}