[Levitan]

Реализовал таким образом.

function check()
 	{if (brief1.checked == true)
	{window.open("https://webformat.by/brief/brief-design.php");}
	else if (brief2.checked == true)
	{window.open("https://webformat.by/brief/brief-icons.php");}
	else if (brief3.checked == true)
	{window.open("https://webformat.by/brief/brief-banner.php");}
	else if (brief4.checked == true)
	{window.open("https://webformat.by/brief/brief-logo.php");}
	else if (brief5.checked == true)
	{window.open("https://webformat.by/brief/brief-style.php");}
	else (brief6.checked == true)
	{window.open("https://webformat.by/brief/brief-brandbook.php");}
	}