function clickButton(e, buttonid) {

    var evt = e ? e : window.event;

    var bt = document.getElementById(buttonid);



    if (bt) {

        if (evt.keyCode == 13) {

            bt.click(); 

            return false;

        }

    }

}





// http://bytes.com/topic/javascript/answers/437156-allow-only-numbers-input

function checkForFloat(evt) {

    var charCode = (evt.which) ? evt.which : event.keyCode;

    

    return ( (charCode >= 48 && charCode <= 57) || charCode == 44 || charCode == 46 );

}





function setStyleProp(elem, newStyle) {  // http: //stackoverflow.com/questions/344162/set-html-elements-style-property-in-javascript

    // Standards base browsers 

    elem.setAttribute('style', newStyle);



    // Non Standards based IE browser

    elem.style.setAttribute('cssText', newStyle);

}



function showHideElement(id) {

    var elem = document.getElementById(id);

    

    if (elem != undefined) {

        var style = elem.getAttribute('style');

        if (style == undefined) style = elem.getAttribute('cssText');  // bud pre ine prehliadace alebo pre explorer zoberieme style property



        if (style != undefined) {

            if (style == "") {

                setStyleProp(elem, "display:none;");

            } else {

                setStyleProp(elem, "");

            }

        } else {

            setStyleProp(elem, "display:none;");

        }

    }

}