var dop = new Array(
		'first',
		'second',
		'third',
		'fourth',
		'fifth'
		);


function ShowHide (div_box) {
	var diva  = document.getElementById(div_box);
	
	diva.style.display = "block";
	for (i=0; i<dop.length; i++)
	{
		if (!document.getElementById(dop[i]))
			continue;
		if(div_box != dop[i])
			document.getElementById(dop[i]).style.display = "none";
		else {diva.style.display = "block";}
	}

}