/**
 * Image swapping routing used for galleries of photos used on project and
 * property pages.
 */
function swap_property_image (image_num)
{
    var src_lg, pre_lg, post_lg, src_sm, pre_sm, post_sm;
    
    src_lg = document.getElementById("image_0").src;
    pre_lg = src_lg.substring(0,src_lg.lastIndexOf("/"));
    post_lg = src_lg.substring(src_lg.lastIndexOf("/"));
    
    src_sm = document.getElementById("image_"+image_num).src;
    pre_sm = src_sm.substring(0,src_sm.lastIndexOf("/"));
    post_sm = src_sm.substring(src_sm.lastIndexOf("/"));

    document.getElementById("image_0").src = pre_lg + post_sm;
    document.getElementById("image_"+image_num).src = pre_sm + post_lg;
}