jQuery(document).ready(function()
{                  
	$('.all_ch1').click(function()
	{
		var checked_status = this.checked;          
		$('.ch1').each(function()
		{
			this.checked = checked_status;          
		});          	
	});          
	$('.all_ch2').click(function()
	{
		var checked_status = this.checked;          
		$('.ch2').each(function()
		{
			this.checked = checked_status;          
		});          	
	});          
	
	$('.all_ch3').click(function()
	{
		var checked_status = this.checked;          
		$('.ch3').each(function()
		{
			this.checked = checked_status;          
		});          	
	});

	$('.all_ch4').click(function()
	{
		var checked_status = this.checked;          
		$('.ch4').each(function()
		{
			this.checked = checked_status;          
		});          	
	});  	

});