// browser definitions

var agt=navigator.userAgent.toLowerCase();
var is_major = parseInt(navigator.appVersion);
var is_minor = parseFloat(navigator.appVersion);
var is_nav  = ((agt.indexOf('mozilla')!=-1) && (agt.indexOf('spoofer')==-1) && (agt.indexOf('compatible') == -1) && (agt.indexOf('opera')==-1) && (agt.indexOf('webtv')==-1));

var is_nav4 = (is_nav && (is_major == 4));
var is_nav4up = (is_nav && (is_major >= 4));
var is_nav6 = (is_nav && (is_major == 5));
var is_nav6up = (is_nav && (is_major >= 5));
var is_ie   = (agt.indexOf("msie") != -1);
var is_ie3  = (is_ie && (is_major < 4));
var is_ie4  = (is_ie && (is_major == 4) && (agt.indexOf("msie 5.0")==-1));
var is_ie4up  = (is_ie  && (is_major >= 4));
var is_ie5  = (is_ie && (is_major == 4) && (agt.indexOf("msie 5.0")!=-1));
var is_ie5up  = (is_ie && !is_ie3 && !is_ie4);
var is_opera = (agt.indexOf("opera") != -1);
var is_opera4 = (is_opera && (is_major == 4));
var is_opera5 = (is_opera && (is_major == 5));
var is_opera5up = (is_opera && (is_major >= 5));

var is_domcom = ((is_nav6up)||(is_ie5up)||(is_opera5up))
var is_mac    = (agt.indexOf("mac")!=-1);
var is_mac68k = (is_mac && ((agt.indexOf("68k")!=-1) || (agt.indexOf("68000")!=-1)));
var is_macppc = (is_mac && ((agt.indexOf("ppc")!=-1) || (agt.indexOf("powerpc")!=-1)));

var _timeout	= 150;

//pulldown menu start 

function getElementById(_id) {

	var _el;

	if(is_domcom) {
		_el	= document.getElementById(_id);
	} else if(is_ie4) {
		_el	= document.all[_id];
	}

	return _el;
}

function _showMenu(_objID) {
	var _obj	= getElementById(_objID);
	if(_obj) {
		_obj.style.display	= 'block';
	}
}

function _hideMenu(_objID) {
	var _obj	= getElementById(_objID);
	if(_obj) {
		_obj.style.display	= 'none';
	}
}

/*************************************************
 *	shows element with id passed as parameter
 *************************************************/
function showSubmenu(_id) {

	var _el	= getElementById(_id);
	if(_el) {
		if(_el.timer) {
			clearTimeout(_el.timer);
		}
		 _showMenu(_id);
	}
}

/*************************************************
 *	hides element with id passed as parameter
 *************************************************/

var time

function hideSubmenu(_id) {

	var _el	= getElementById(_id);

	if(_el) {
		var _timer	= setTimeout("_hideMenu('" + _id + "')", _timeout);
		_el.timer	= _timer;
	}
}



function opacity(id, opacStart, opacEnd, millisec) {
    //speed for each frame
    var speed = Math.round(millisec / 100);
    var timer = 0;

    //determine the direction for the blending, if start and end are the same nothing happens
    if(opacStart > opacEnd) {
        for(i = opacStart; i >= opacEnd; i--) {
            setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
            timer++;
        }
    } else if(opacStart < opacEnd) {
        for(i = opacStart; i <= opacEnd; i++)
            {
            setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
            timer++;
        }
    }
}

//change the opacity for different browsers
function changeOpac(opacity, id) {
    var object = document.getElementById(id).style;
    object.opacity = (opacity / 100);
    object.MozOpacity = (opacity / 100);
    object.KhtmlOpacity = (opacity / 100);
    object.filter = "alpha(opacity=" + opacity + ")";
} 


function showMenu() {
	document.getElementById("menuDiv").style.display = "block";
}

function over(obj,img) {
	obj.style.background = "url("+img+") no-repeat";
}


function checkBabyForm(formName) {
	if (formName.Name.value == ""){
    alert("Zadajte meno");
    return false;
   }
   
   if (formName.surname.value == ""){
    alert("Zadajte priezvisko");
    return false;
   }
   
   if (formName.kurz.value == ""){
    alert("Zadajte čo ste navštevovali");
    return false;
   }
   
   if (formName.learned.value == ""){
    alert("Zadajte čo ste sa naučili");
    return false;
   }
   
   if (formName.email.value == ""){
    alert("Zadajte e-mail");
    return false;
   }
   
   if (formName.foto.value == ""){
    alert("Vložte foto");
    return false;
   }
}

function autoIframe(frameId){
	try{
		frame = document.getElementById(frameId);
		innerDoc = (frame.contentDocument) ? frame.contentDocument : frame.contentWindow.document;
		objToResize = (frame.style) ? frame.style : frame;
		objToResize.height = innerDoc.body.scrollHeight + 10;
	}
	catch(err){
		window.status = err.message;
	}
}