function sortByLastName(){
        var someElement;
        try {
            someElement = document.getElementsByClassName("user");
            someArray = [].slice.call(someElement);

            var reA = /[^a-zA-Z]/g;
            var reN = /[^0-9]/g;
                          
            someArray.sort(function(a,b) {
                if((a.attributes['data-user'].nodeValue !== null) && (b.attributes['data-user'].nodeValue !== null))
                {                   
                    var smlla = a.attributes['data-user'].nodeValue.toLowerCase();
                    var smllb = b.attributes['data-user'].nodeValue.toLowerCase();  
                
                    var aA = smlla.replace(reA, "");
                    var bA = smllb.replace(reA, "");
                    if(aA === bA) {
                        var aN = parseInt(a.attributes['data-user'].nodeValue.replace(reN, ""), 10);
                        var bN = parseInt(b.attributes['data-user'].nodeValue.replace(reN, ""), 10);
                        return aN === bN ? 0 : aN < bN ? 1 : -1;
                    } else {
                        return aA < bA ? 1 : -1;
                    }    
                }    
                else
                    return 0;           
            }); 

            console.log(someArray.documentElement.innerHTML);
            console.log(someElement.documentElement.innerHTML);
            console.log(dummy);
            console.log(dummy);

            someElement.documentElement.innerHTML = someArray.documentElement.innerHTML;
              
            for (var i = 0, len = someArray.length; i < len; i++ ) {
                console.log(someArray[i].attributes);
                console.log(someArray[i].attributes.class);
                console.log(someArray[i].attributes['data-user']);
                someElement[0].nodeValue = someArray[0].nodeValue;
                document.getElementsByClassName("user")[0].nodeValue = someArray[0].nodeValue;
                console.log(document.getElementsByClassName("user")[0].nodeValue);  
                console.log(someArray[0].nodeValue);                              
            }            
            
        }
        catch(err) {
            console.log("Error occured");
            console.log(err);
        }        
        console.log(i);
        console.log("fuck");
        console.log("fuckf");            
    };