function initOnDomLoaded() { // 2.0
	var name='', a=document.getElementById('cont').getElementsByTagName('a');
	for(var i=0,len=a.length; i<len; i++) {
		if(name=a[i].name) {
			name=name.replace(':', '@');
			a[i].href='mailto:'+ name;
			if(!a[i].innerHTML) {
				a[i].innerHTML=name;
			}
		}
	}
}

function isDomLoaded() {
	(/loaded|complete/.test(document.readyState) ? initOnDomLoaded() : setTimeout(arguments.callee, 10));
}

if(document.addEventListener) {
	document.addEventListener('DOMContentLoaded', initOnDomLoaded, false); // firefox, opera9.02
	if((window.opera && window.opera.version() < 9.02) || /WebKit|Khtml/i.test(navigator.userAgent)) { // opera<9.02, safari, konqueror
		isDomLoaded();
	}
} else { // ie5,6,7
	initOnDomLoaded();
}

function imgSwap(link) {
    document.getElementById('gal').src = link.href;
	return false;
}

function prodRedir(sel) {
	window.location = 'produkty_'+ sel.name + sel.value +'.htm';
}

function imager(link) {
	if(!(alt=link.childNodes.item(0).alt)) {
		if(!(alt=link.href.substring(link.href.lastIndexOf('/') + 1))) {
			alt='obrázek';
		}
	}
	window.open('image.htm?src=' + escape(link.href) + '&alt=' + escape(alt) + '', '_blank', 'width=500, height=375, top=50, left=50, resizable=yes, scrollbars=no, toolbar=no, location=no, directories=no, status=yes, menubar=no, copyhistory=no');
	return false;
}

function blank(link) {
	link.target='_blank';
}

function menu_onoff(item)
{
    with (document.getElementById(item).style) {
        display = ((display == "none") ? "block" : "none");
        return true;
    }
    return false;
}

function emailCheck(field, alert_string)
{
    if (alert_string == "") { alert_string = "Zadejte e-mail."; }
	return eregCheck(alert_string, field, /^[^ @]+@[^ @]+\.[^ @]+$/);
}

function eregCheck(alert_string, field, regexp)
{
	if (field.value == '' || regexp.test(field.value)) {
		return true;
	} else {
        field.focus();
        alert(alert_string);
        return false;
    }
}

function ulozitCheck(f)
{
    if (arguments[1] == "") {
        alert_string = "Nejsou zadány povinné údaje,\n formulář nelze odeslat!";
    } else {
        alert_string = arguments[1];
    }
    for (i=2; i<arguments.length; i++) {
        if (f[arguments[i]].value == "") {
            f[arguments[i]].focus();
            window.alert(alert_string);
            return false;
        }
    }
    return true;
}