function clickshow(num)
{
	var SubMenuCount = 4;
	
	for (i = 1; i <= SubMenuCount; i++)
	{
		menu = eval("document.all.block" + i + ".style");

		if (num == i)
		{
			if (menu.display == "block")
				menu.display = "none";
		    else               
		        menu.display = "block";
		}
		else
		{            
		    menu.display = "none";
		}		
	}
}