function select_content(tab_num) {
	bgcolor = "";
	switch(tab_num)	{
		case 1:
		  bgcolor = "#e7e6f0";
		  break;
		case 2:
		  bgcolor = "#e6ecf4";
		  break;
		case 3:
		  bgcolor = "#e7f1ef";
		  break;
		case 4:
		  bgcolor = "#e9f1eb";
		  break;
	}
		
	// Reset color
	$$('div.selectors').each(function(c) { c.style.backgroundColor = "#fff"; });
	// Set color
	$("selector_" + tab_num).style.backgroundColor = bgcolor;
	$("selector_content").style.backgroundColor = bgcolor;
	// Show tab
	$$('div.selector_contents').each(function(c) { c.hide(); });
	$("selector_content_" + tab_num ).show();
	return false;
}