/*
 *get elements by classname
 *
 */
document.getElementsByClassName = function (classname, node) {
    // use strict mode for debugging uncomment it
    //"use strict";
    if(!node){
        node = document.getElementsByTagName("body")[0];
    }
    var a = [];
    var re = new RegExp('\\b' + classname + '\\b');
    var els = node.getElementsByTagName("*");
    for(var i=0,j=els.length; i<j; i++){
        if(re.test(els[i].className)){
            a.push(els[i]);
        }
    }
    return a;
};
/*
* toggle function for display option show/hide
* greps the element by the given name and toggles
* the display option
*
* style.display = none <> style.display = block
*
*/
document.toggle = function(name){
    // use strict mode for debugging uncomment it
    //"use strict";
    //get all needed elements by name
    var elements = document.getElementsByClassName(name);

    //toggle all elements display options
    for(var i = 0; i < elements.length; i++)
    {
        var elem = elements[i];
        if (elem.style.display === "none")
        {
            elem.style.display = "block";
        }else{
            elem.style.display = "none";
        }
    }
};