Help Needed Please

This is code for Button

var thename = this.getField(event.target.name);

N = thename.name.substring(4,thename.name.length);

AddToCart(N);

And add to cart function is

function AddToCart(added)

{

this.calculate = false;

var lstItemNum = this.getField("lstItemNum")

var lstItem = this.getField("lstItem")

var lstPrice = this.getField("lstPrice")

IName = lstItem.getItemAt(added-1)

/* original script

var NI = this.getField("TotalNumItems");

NI.value = NI.value+1

var Dest = this.getField("Description."+NI.value)

var INum = this.getField("INum."+NI.value)

var UPrice = this.getField("UPrice."+NI.value)

var Quant = this.getField("Quantity."+NI.value)

var TPrice = this.getField("TPrice."+NI.value)

Dest.value = IName

INum.value = lstItemNum.getItemAt(added-1)

UPrice.value = lstPrice.getItemAt(added-1)

Quant.value = "1"

TPrice.hidden = false

*/

// corrected script

{

var NI = this.getField("TotalNumItems");

NI.value = NI.value+1

var Dest = this.getField("Description."+NI.value)

var INum = this.getField("INum."+NI.value)

var UPrice = this.getField("UPrice."+NI.value)

var Quant = this.getField("Quantity."+NI.value)

var TPrice = this.getField("TPrice."+NI.value)

Dest.value = IName

INum.value = lstItemNum.getItemAt(added-1)

UPrice.value = lstPrice.getItemAt(added-1)

Quant.value = "0"

TPrice.hidden = false

}

// end correction

this.calculate = true

}