monobehaviour script accessing problem causes error

 hello and hi,
      i am using one monobehaviour script named 
inverseKinematics.js
i want to access this script in another script
named say xyz.js
in xyz.js i am writing

    var target : Transform;
    var elbowTarget : Transform;
    
    var inverseKinematicsScript : MonoBehaviour;
    //private var inverseKinematicsScript ;
    
    function Start(){
    	inverseKinematicsScript = GetComponent(inverseKinematics);
    }
    
    function Update () {
    	inverseKinematicsScript.target = target.position;
    	inverseKinematicsScript.elbowTarget = elbowTarget.position;
    	inverseKinematicsScript.CalculateIK();                                     }

then i am getting errors in another files 
related to this file are

BCE0019: 'CalculateIK' is not a member of 'UnityEngine.MonoBehaviour'. 

BCE0019: 'target' is not a member of 'UnityEngine.MonoBehaviour'. 

BCE0019: 'elbowTarget' is not a member of 'UnityEngine.MonoBehaviour'. 
//-----------------------------------------------
my inverseKinematics.js is
//-----------------------------------------------
    var target : Vector3;
    var elbowTarget : Vector3;
    
    function CalculateIK(){
    	transform.LookAt(target, transform.position - elbowTarget);
    	var upperArm : Transform = transform.Find("upperArm");
    	var elbow : Transform = transform.Find("upperArm/elbow");
    	var hand : Transform = transform.Find("upperArm/elbow/hand");
    	var upperArmLength : float = Vector3.Distance(upperArm.position, elbow.position);
    	var forearmLength : float = Vector3.Distance(elbow.position, hand.position);
    	var armLength : float = upperArmLength + forearmLength;
    	var hypotenuse : float = upperArmLength;
    	var targetDistance : float = Vector3.Distance(upperArm.position, target);
    	targetDistance = Mathf.Min(targetDistance, armLength - 0.0001); //Do not allow target distance be further away than the arm's length.
    	var adjacent : float = targetDistance * (upperArmLength / armLength);
    	var ikAngle : float = Mathf.Acos(adjacent/hypotenuse) * Mathf.Rad2Deg;
    	upperArm.LookAt(target, transform.root.up);
    	upperArm.localRotation.eulerAngles.x += ikAngle;
    	elbow.LookAt(target, transform.root.up);
    }

 so please suggest me what should i do.....

you are declaring your inverseKinematicsScript with type Monobehavior, when you want its type to be inverseKinematics.

Try changing this line:

var inverseKinematicsScript : MonoBehaviour;

to

var inverseKinematicsScript : inverseKinematics;