function setTabs(param)
{
	var link_c = document.getElementById("tab_c");
	var link_d = document.getElementById("tab_d");
	var content_c = document.getElementById("sheet_c");
	var content_d = document.getElementById("sheet_d");
		
	if (param)
	{
		link_c.className = "current";
		content_c.style.display = "";
		link_d.className = "";
		content_d.style.display = "none";
	}
	else
	{
		link_d.className = "current";
		content_d.style.display = "";
		link_c.className = "";
		content_c.style.display = "none";
	}
}

function showHiddenBlock(blockName)
{
	var block = document.getElementById(blockName);
	if(block.style.display == "none")
	{
		block.style.display = "";
	}
	else
	{
		block.style.display = "none";
	}
}