function plusMinus(id, znak, hodnota, mez) {
	var el = document.getElementById(id);
	if (el == null)
		return;
	if (el.value == '') 
		el.value = 0;
	
  	if (el.value.search(/^\d{1,5}$/)!=-1) {
	 	if (znak=='-') {
	  		if (el.value % hodnota != 0) {
				el.value = Number(el.value) - (el.value % hodnota) + hodnota;
			}
		if (Number(el.value)-hodnota >= mez) {
		 	el.value = Number(el.value) - hodnota;
		}
	 } else if (znak=='+') {
	 	el.value = Number(el.value) - (el.value % hodnota);
		if (Number(el.value) + hodnota<=mez) {
		  	el.value = Number(el.value) + hodnota;
		}
	 }
  }
}

function setCookie(name, value, expiredays, path, domain, secure) {
  var exdate=new Date();
  exdate.setDate(exdate.getDate()+expiredays);
  var curCookie = name + "=" + escape(value) +
      ((expiredays) ? "; expires=" + exdate.toGMTString() : "") +
      ((path) ? "; path=" + path : "") +
      ((domain) ? "; domain=" + domain : "") +
      ((secure) ? "; secure" : "");
  document.cookie = curCookie;
}

function deleteCookie(name, path, domain) {
  if (getCookie(name)) {
    document.cookie = name + "=" +
    ((path) ? "; path=" + path : "") +
    ((domain) ? "; domain=" + domain : "") +
    "; expires=Thu, 01-Jan-70 00:00:01 GMT";
  }
}

function getCookie(name) {
  var dc = document.cookie;
  var prefix = name + "=";
  var begin = dc.indexOf("; " + prefix);
  if (begin == -1) {
    begin = dc.indexOf(prefix);
    if (begin != 0) return null;
  } else
    begin += 2;
  var end = document.cookie.indexOf(";", begin);
  if (end == -1)
    end = dc.length;
  return unescape(dc.substring(begin + prefix.length, end));
}

var __nonMSDOMBrowser = (window.navigator.appName.toLowerCase().indexOf('explorer') == -1);

function FireDefaultButton(event, target) {
        if (event.keyCode == 13 && !(event.srcElement && (event.srcElement.tagName.toLowerCase() == "textarea"))) {
        var defaultButton;
        if (__nonMSDOMBrowser) {
            defaultButton = document.getElementById(target);
        }
        else {
            defaultButton = document.all[target];
        }
        if (defaultButton && typeof(defaultButton.click) != "undefined") {
            defaultButton.click();
            event.cancelBubble = true;
            if (event.stopPropagation) event.stopPropagation();
            return false;
        }
    }
    return true;
}

function TextBoxKeyHandler(event) {
    if (event.keyCode == 13) {
        var target;
        if (__nonMSDOMBrowser) {
            target = event.target;
        }
        else {
            target = event.srcElement;
        }
        if ((typeof(target) != "undefined") && (target != null)) {
            if (typeof(target.onchange) != "undefined") {
                target.onchange();
                event.cancelBubble = true;
                if (event.stopPropagation) event.stopPropagation();
                return false;
            }
        }
    }
    return true;
}

function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function() {
			if (oldonload) {
				oldonload();
			}
			func();
		}
	}
}