function addLoadEvent(func) {
	var oldonload = window.onload; 
	if (typeof window.onload != 'function') { 
		window.onload = func; 
	} else { 
		window.onload = function() { 
			if (oldonload) { 
				oldonload(); 
			} 
			func(); 
		} 
	} 
}

function hideDiv(id_name)
{ 
	if (document.getElementById)
	{
		// DOM3 = IE5, NS6 
		document.getElementById(id_name).style.display = 'none'; 
	}
	/* 
	else if (document.layers)
	{
		// Netscape 4 
		document.hideshow.visibility = 'hidden'; 
	} 
	else
	{
		// IE 4 
		document.all.hideshow.style.visibility = 'hidden'; 
	}
	*/
}

function showDiv(id_name)
{ 
	if (document.getElementById)
	{
		// DOM3 = IE5, NS6 
		document.getElementById(id_name).style.display = 'block'; 
	}
	/*
	else if (document.layers)
	{
		// Netscape 4 
		document.hideshow.visibility = 'visible'; 
	} 
	else
	{
		// IE 4 
		document.all.hideshow.style.visibility = 'visible'; 
	}
	*/
}