JavaScript: Splash Screen error.

(6,9)Unexpected token: yield

(6,14)Insert a semicolon at the end.

.

#pragma strict

function Start () {

{
	yield WaitForSeconds (3);
	Application.LoadLevel ("MainMenu");
}

function Update () 

{

}

You have an extra curly brace. You can get rid of the one on line 3 or the one on line 5.

function Start () {
 
{
    yield WaitForSeconds (3);
    Application.LoadLevel ("MainMenu");
}

This would work, for example:

function Start ()
{
    yield WaitForSeconds (3);
    Application.LoadLevel ("MainMenu");
}

Each { in your program requires a corresponding } to close the code block.