A GUI error in script??? HELP,Please!!

I created a Unity Script for my main camera but error popped up again and again... I want to add the main menu with the presenting and attractive style but Unity is showing that there are errors... Here's the code:-

 // Make the script also execute in edit mode
 @script ExecuteInEditMode()
 
 var cyberXZone : Transform;
 var background : Texture2D;
 var skin : GUISkin;
 private var isCompany = cyberXZone.renderer.enabled == false;
 
 private var isLoading = false; // if true, we'll display the "Loading..." message.
 
 function Start()
 {
  isCompany = true;
  company = Instantiate(cyberXZone);
  company.transform.position = new Vector3(20.14709,5.569142,12.45592);
  if(isCompany.Time.timeSinceLevelLoad = 10.0)
     {
         isCompany = false;
         while(timer < fadeTime)
         {
             tunnelAudio.volume = Mathf.Lerp(0, tunnelVolume, timer / fadeTime);
             timer += Time.deltaTime;
             yield;
         }
     }
 }
 
 function OnGUI()
 {
  if(isCompany == false) {
 if (skin)
 GUI.skin = skin;
 else
 Debug.Log("GUI Skin object missing!");
 
 var backgroundStyle : GUIStyle = new GUIStyle();
 backgroundStyle.normal.background = background;
 GUI.Label ( Rect( (Screen.width - (Screen.height * 2)) * 0.75, 0, Screen.height * 2,
 Screen.height), "", backgroundStyle);
 
 GUI.Label ( Rect( (Screen.width/2)-197, 50, 400, 100), "Car Race",
 "mainmenutitle");
 
 if (GUI.Button( Rect( (Screen.width/2)-70, Screen.height - 160, 140, 70), "Play"))
 {
 isLoading = true;
 Application.LoadLevel("1"); // load the game level.
 }
 
 var isWebPlayer = (Application.platform == RuntimePlatform.OSXWebPlayer ||
 Application.platform == RuntimePlatform.WindowsWebPlayer);
 if (!isWebPlayer)
 {
 if (GUI.Button( Rect( (Screen.width/2)-70, Screen.height - 80, 140, 70), "Quit"))
 Application.Quit();
 }
 
 if (isLoading)
 GUI.Label ( Rect( (Screen.width/2)-110, (Screen.height / 2) - 60, 400, 70),
 "Loading...", "loading");
 }
 }

Error is:- Assets/main menu-car.js(16,39): BCE0044: expecting ), found '='.

(Filename: Assets/main menu-car.js Line: 16)

Assets/main menu-car.js(16,41): BCE0043: Unexpected token: 10.0.

(Filename: Assets/main menu-car.js Line: 16)

Assets/main menu-car.js(18,27): BCE0044: expecting :, found '='.

(Filename: Assets/main menu-car.js Line: 18)

I hope someone can help me....And thank you in advance....