var checkflag = "false";

function check(field)
{	
	//If more than one checkbox in group
	if (field.length)
	{		
		//alert(field.length);
		if (checkflag == "false")
		{
			for (i = 0; i < field.length; i++)
				field[i].checked = true;
			checkflag = "true";
			return "All";
		}
		else
		{
			for (i = 0; i < field.length; i++)
				field[i].checked = false;
			checkflag = "false";
			return "All";
		}
	}
	else
	{
		//alert("No length");
		if (checkflag == "false")
		{
			field.checked = true;
			checkflag = "true";
			return "All";
		}
		else
		{
			field.checked = false;
			checkflag = "false";
			return "All";
		}		
	}
}