// JavaScript Document
function show_block(n) 
{
	/* first, make sure all the content blocks are hidden */
	for (i=0; i<=num_tabs; i++) 
	{
		document.getElementById("tab_" + i).style.display = 'none';
		document.getElementById("tab_link_" + i).className = '';
	}
	/* now show the content block you want */
	document.getElementById("tab_" + n).style.display = 'block';	
	document.getElementById("tab_link_" + n).className = 'tab_active';		
}