function sh(id, num)
{
	var ids;
	var el;
	var r;

	for(r=1;r<=num;r++)
	{
	try{ 
		ids = "firm"+r;
		if (r!=id){
			el=document.getElementById(ids);
			el.style.display="none";
		};
	}
	catch(e){};		
	};
	
	ids = "firm"+id;
	el=document.getElementById(ids);
	if (el.style.display=="none")
	{
		el.style.display="block";
	}
	else 
	{
		el.style.display="none";
	}
	
};