Helppp mee script unity 5

convert to unity 5

 var quit=false;
 
 function OnMouseEnter()
 {
 
 renderer.material.color = Color.red;    //Change Color to red!
 
 }
 
 function OnMouseExit()
 {
 
 renderer.material.color = Color.white;    //Change Color to white!
 
 }
 
 function OnMouseUp()
 {
 
 if (quit == true)
 {
 Application.Quit();    //If you click on quit aplication quits.
 }
 else
 {
 Application.LoadLevel(1);    //If you click on other button it loads game!
 }
 
 }
 
 function Update()
 {
 if (Input.GetKey(KeyCode.Escape)) //If you press (escape) game force closes!
 {
 Application.Quit();
 }
 
 }