Convert all keyframes to easy ease or linear

Hi there

I m new around and scripting. I write some code that iterates through all items, comps, layers then activates motion blur for each layer, comps.

Where i stuck is reaching all properties of all layers in all comps then every keyframes and change interpolation to easy ease or linear. Here is my script for motion blur :

[code]

//Enables disables motion blur for all layers and activates global motion blur switch for all comps.

//.numItems = extracts total number of items in defined variable = proj;

var proj = app.project;

var itemTotal = proj.numItems;

var curItem, curComp, totalComps, totalLayers, curLayer;

var itemAry = new Array ();

//iterate all items through project

for (var i = 1; i<= itemTotal; i++){

curItem = proj.item(i);

//check if current item is a comp

if(curItem instanceof CompItem){

    itemAry[itemAry.length] = curItem;

    }

    }

totalComps = itemAry.length;

for (var c = 0; c<totalComps; c++){

    curComp = itemAry[c];

    totalLayers = curComp.numLayers;

//enable global motion blur for all comps   

    curComp.motionBlur = true;

//loop layers + iterate all layers and enable motion blur for iterated layers

    for (var l=1; l<=totalLayers; l++){

        curLayer = curComp.layer (l);

//enable motion blur for all iterated current layers

        curLayer.motionBlur=true;

        }

    }

[/code]

I dont know if i can continue from here on or need to start from scratch. Any help or tip will be appreciated.