var legend1Image = "Images/Dewberry/DataFrame/Legend1.gif";
var legend2Image = "Images/Dewberry/DataFrame/Legend2.gif"

function switchLayer(){
    if(tiledMapServiceLayer1.visible){
        tiledMapServiceLayer1.hide();
        tiledMapServiceLayer2.show();
    }else{
       tiledMapServiceLayer2.hide();
        tiledMapServiceLayer1.show();
    }
    
    switchLegendImage();
}

function switchLegendImage(){
    var legend = dojo.byId("legend");
    if(legend.src.indexOf(legend1Image) != -1){
        legend.src = legend2Image;
    }else{
        legend.src = legend1Image;
    }
}