function form_check_all_checkbox(obj, s_id) {
	if(obj.checked) { 
		$(':checkbox[id^=element_]').attr('checked','checked');
	}
	else {
		$(':checkbox[id^=element_]').removeAttr('checked');
	}
}

$(document).ready(function() {
	/* for expanded manu*/
	if (-1 == (pos = document.cookie.indexOf('expanded='))) {
	        var expand = true;
	} else {
	        var end = document.cookie.indexOf(';', pos);
	        var value = document.cookie.substring(pos + 9, -1 == end? document.cookie.length: end);
	        var expand = ('yes' == value);
	}
	
	if (!expand) {
	        $('#expand_menu').hide();
	        $('#toggle').text('Menyuni kursat');
	}
	
	$('#expand_menu').data('visible', expand);
	
	$('#toggle').click(function() {                 
	        this.blur();
	        var menu = $('#expand_menu');
	        var visible = menu.data('visible');
	        menu.slideToggle("slow");
	        if (visible) {
	                $(this).text('Menyuni kursat');
	        } else {                                
	                $(this).text('Menyuni yopish');
	        }
	        
	        menu.data('visible', !visible);
	        
	        var nextYear = new Date();
	        nextYear.setFullYear(nextYear.getFullYear() + 1);
	        document.cookie = 'expanded=' + (visible? 'no': 'yes') +
	                '; expires=' + nextYear.toGMTString() +
	                '; path=/'; 
	});
	/* end expanded menu */
});