get/set lookup value in CRM 4

 
/* Jscript */

                   
// get lookup 
gLookupGetValue = function (objLookup){
    /*
     This function is used read a value from lookup field
     This function requires the following parameters:
     objLookup:     reference to the lookup object e.g. crmForm.all.productid
     Returns:        Array
     [0] = returns lookup GUID
     [1] = returns lookup text value
     [2] = returns lookup entity type name (e.g. account)
     [3] =//returns lookup entity type code  (e.g. 1=account), 2=contact, etc)
     Example:
     var name  = gLookupGetValue(crmForm.all.accountid)[1]
     Author: GP
     */

    var lookupItem = new Array;
    var arr = new Array();
    arr[0] = "";    //returns lookup GUID
    arr[1] = "";    //returns lookup text value
    arr[2] = "";    //returns lookup entity type name (e.g. account)
    arr[3] = "";    //returns lookup entity type code  (e.g. 1=account), 2=contact, etc)
    // Get a reference to the lookup control on the form.
    lookupItem = objLookup.DataValue;

    // If there is data in the field, show it in a series of alerts.
    if (lookupItem != null){
        // Return the GUID of the lookup.
        arr[0] = lookupItem[0].id;
        // Return the text value of the lookup.
        arr[1] = lookupItem[0].name;

        // Return the entity type name of the lookup.
        arr[2] = lookupItem[0].typename;

        // Return the entity type code of the lookup.
        arr[3] = lookupItem[0].type;
    }
    return arr;
}
// set lookup
gLookupSetValue= function(objID, objText, objType){
    /*
     This function is used set a defaultvalue in a lookup field and requires the following parameters:
     objID:   ID of the record
     objText:  Text or Name of the record
     objType:  Entity code or Entity Name
     Returns: lookup object
     Designed by: Geron Profet
     Example 1: retrieve based on entity type code
     var defaultpricelevelname = 'Standard';
     var defaultpricelevelid = gGetValue('pricelevelid','pricelevel','name',defaultpricelevelname)[2];
     crmForm.all.pricelevelid.DataValue = gLookupSetValue(defaultpricelevelid, defaultpricelevelname, 1022);

     Example 2: retrieve based on entity type name
     crmForm.all.pricelevelid.DataValue = gLookupSetValue(defaultpricelevelid, defaultpricelevelname, 'pricelevel');
     */

    // Create a lookupItem to store the values that you want to set to a target lookup control.
    var lookupData = new Array();
    var lookupItem= new Object();

    //Set the id, name and typecode or typename properties to the object.
    lookupItem.id = objID;
    lookupItem.name = objText;

    //if objType is not numeric, assume the entitytypename is passed
    if (!isNaN(objType)){
        lookupItem.type = objType;
    } else {
        lookupItem.typename = objType;
    }

    // Add the object to the array and return the lookupItem that you just created.
    lookupData[0] = lookupItem;
    return lookupData;
}