Texture Changing

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var texture1 : Texture2D;
var texture2 : Texture2D;
var change : boolean = true;

function Start() {
    changeTexture();
}

function Update () {

}

function changeTexture () {

    while(change) {
        yield WaitForSeconds(0.5);
        renderer.material.mainTexture = texture1;
        yield WaitForSeconds(0.5);
        renderer.material.mainTexture = texture2;
    }
}