function openMenu(menu_item,max_rows)
{			
	for(var i = 1; i <= max_rows; i++)
	{
		element = document.getElementById(menu_item+'_'+i);
		
		if(navigator.userAgent.indexOf("Firefox") != -1)
		{
			if(element.style.display == "table-row")
			{
				element.style.display  = "none";
			}
			else
			{
				element.style.display = "table-row";
			}
		}
		else
		{
			if(element.style.display == "block")
			{
				element.style.display  = "none";
			}
			else
			{
				element.style.display = "block";
			}
		}
	}
}