retrieving and comparing xml data

In the following code, i am submitting 'suburb' value through HTML form then this value 开发者_JS百科match with the suburb of 'address' element of xml file. which i have done and it showing all addresses of that suburb on google map but i need to display just two addresses of that suburb that offer less rent.

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The steps you need to take in order to get the two cheapest rental properties are:

1. Get all properties within the your specified location into an array.
2. Sort the array based on price of the rent.
3. Take the first two items of the array.