//// Start RadialMenu.txt ////

"Warnings,Survivor,Alive"
	{
		"Center"
		{
			"command"	""
			"text"		"Cancel"
		}
		"North"
		{
			"command"	"say_team WITCH!!!; vocalize PlayerWarnWitch"
			"text"		"Spot Witch"
		}
		"NorthEast"
		{
			"command"	"say_team SMOKER!; vocalize PlayerWarnSmoker"
			"text"		"Spot Smoker"
		}
		"East"
		{
			"command"	"say_team TANK!; vocalize PlayerWarnTank"
			"text"		"Spot Tank"
		}
		"SouthEast"
		{
			"command"	"say_team HORDE!; vocalize PlayerIncoming"
			"text"		"Spot Horde"
		}
		"South"
		{
			"command"	"say_team thx; vocalize PlayerThanks"
			"text"		"Thanks"
		}
		"SouthWest"
		{
			"command"	"say_team HELP!; vocalize PlayerHelp"
			"text"		"HELP ME!"
		}
		"West"
		{
			"command"	"say_team HUNTER!; vocalize PlayerWarnHunter"
			"text"		"Spot Hunter"
		}
		"NorthWest"
		{
			"command"	"say_team BOOMER!; vocalize PlayerWarnBoomer"
			"text"		"Spot Boomer"
		}
	}
	
//// End Radial Menu ////

//// Start l4d_keys.cfg ////
bind "KEY" 			"+mouse_menu Warnings"
//// End l4d_keys.cfg ////

Copy and paste the text between the ////RadialMenu//// lines into your RadialMenu.txt, then paste the text between ////l4d_keys.cfg//// into your key binding .cfg file, or your autoexec.cfg file.

You might have to re-tab the RadialMenu.txt code.