Why am I getting an unexpected token in the script? XRot and ZRot

#pragma strict

//Speed of rotation degrees per second
var Speed : float = 50.0f;

//Rotation limit
var MaxAngle : float = 30.0f;

private var XCurRotation : float = 0;
private var ZCurRotation : float = 0;

function Update () {

var XRot : float = 0;
var ZRot : float = 0;

	
if(Input.GetKey(KeyCode.W))
	XRot : Time.deltaTime * Speed;
	
if(Input.GetKey(KeyCode.S))
	XRot : Time.deltaTime * -Speed;
			
if(Input.GetKey(KeyCode.A))
	ZRot : Time.deltaTime * Speed;
	
if(Input.GetKey(KeyCode.D))
	ZRot : Time.deltaTime * -Speed;
	
if ((XCurRotation+XRot < -MaxAngle) || (XCurRotation+XRot > MaxAngle))
	return;
if ((ZCurRotation+ZRot < -MaxAngle) || (ZCurRotation+ZRot > MaxAngle))
	return;
	
	
XCurRotation += XRot;
ZCurRotation += ZRot;
	
transform.Rotate (Vector3.right * ZRot);
transform.Rotate (Vector3.forward * XRot, Space.World);

}

Because you have a colon on line 6 (in the code that the site is showing) where you should have an equals.