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////////////////////// Configurable variables /////////////////////////////

    var imgRoot = '../customer/svg/';
    var searchBtn = imgRoot + 'search.svg';
    var dateBtn = imgRoot + 'calendar.svg';

////////////////////// Helpful functions //////////////////////////////////
    
    // function to replace a class name for specified elements
    replaceClass = function(els, oldClass, newClass) 
    {
        while (els.length > 0)
        {
            els[0].className = els[0].className.replace(new RegExp('(?:^|\\s)'+ 
                                    oldClass + '(?:\\s|$)'), newClass);
        }
    };
    
    // sets a specific attribute for all elements in a collection
    setAttributeOnAll = function(els, attrName, attrVal)
    {
        for (var i=0; i < els.length; i++)
            els[i].setAttribute(attrName,attrVal);
    };
    
    // appends a value to an attribute for all elements in a collection
    // can be used to append class name
    appendAttributeOnAll = function(els, attrName, attrVal)
    {
        for (var i=0; i < els.length; i++)
        {
            var curr = els[i].getAttribute(attrName);
            els[i].setAttribute(attrName, curr + ' ' + attrVal);
        }
    };
    
    // get element associated with an item property's "button"
    getItemFieldButton = function(field)
    {
        var itms = document.getElementsByClassName(field);
        return itms[0].getElementsByClassName("sys_f_input_image");
    };
    
    // replace icon on an item property's "button"
    updateItemFieldIcon = function(field,icon)
    {
        var btn = getItemFieldButton(field);
        setAttributeOnAll(btn,'src',icon);
        return btn;
    };