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    "OS": {
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                "layer": "OS",
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                    "description": "Convolutions"
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        ]
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}
var layers = [];
var icon_base = "https://maps.google.com/mapfiles/ms/micons/";
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//"mm_20_red.png", "mm_20_black.png", "mm_20_orange.png", "mm_20_gray.png", "mm_20_brown.png"];
var colors = ["purple.png", "yellow.png", "blue.png", "lightblue.png", "green.png",
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var count = 0;

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        var icon = icon_base + colors[count];

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            pageId:code.replace(/ /g,'_'),
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    layers.push({
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        pageName:layer,
        pageId:layer.replace(/ /g,'_'),
        secondClass:codes
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}

var navOptions = {
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        logo:{
            imgUrl:'',
            linkUrl:''
        },
        showMore:true,
    },
    firstClass:layers
}