var restoreimgsrc="";

function MMon(p){
restoreimgsrc = document.images[p].src;
document.images[p].src=restoreimgsrc.substring(0,restoreimgsrc.length-4)+"_on.gif";
}
function MMof(p){
 document.images[p].src=restoreimgsrc;
}

function Pagelocation(page) {
 if (page.indexOf("/")>=0 ) document.location = page;
}

function imgchange(chimg){
  var imgobj = document.images[chimg];
  imgpath = imgobj.src;
  imgpath_base = imgpath.substring(0,imgpath.length-6);

  switch (imgobj.width){
     case 231:   // normal=>lager
       imgobj.width  = 456;
       imgobj.height = 306;
       imgobj.src=imgpath_base + '_1.jpg';
       break;
     case 456:
       imgobj.width  = 231;
       imgobj.height = 156;
       imgobj.src=imgpath_base + '_2.jpg';
       break;
     case 156:  //vertcal=>v.large
       imgobj.width  = 306;
       imgobj.height = 456;
       imgobj.src=imgpath_base + '_1.jpg';
       break;
     case 306:  //vertcal=>v.large
       imgobj.width  = 156;
       imgobj.height = 231;
       imgobj.src=imgpath_base + '_2.jpg';
       break;
  }

}

function galeryimgshow(imgId, moveToImg){
  currentImg = imgId;
  var imgName = 'galimg' + imgId;	
  var imgobj = document.images[imgName];
  imgpath = imgobj.src;
  imgpath_base = imgpath.substring(0,imgpath.length-5);

  var bgimg = document.images['bgimg'];
  bgimg.src=imgpath_base + '1.jpg';
  if (moveToImg==1) window.location.hash = '#ibk'; //move to img
  showImgToolbars();
}

function showNextGalImg() {
	currentImg++;
	galeryimgshow(currentImg, 0);
}

function showPrevGalImg() {
	currentImg--;
	galeryimgshow(currentImg, 0);
}

function showImgToolbars() {
	var prvBtn = document.getElementById('prevBtn');
	if (currentImg>1) {
		prvBtn.style.display = ''
	} else {
		prvBtn.style.display = 'none'
	}
	
	var nxtBtn = document.getElementById('nxtBtn');
	if (currentImg<galImgCount){
		nxtBtn.style.display = ''
	} else {
		nxtBtn.style.display = 'none'
	}
}

function isValidEmail(email){
 var emailRegExp = "[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z0-9.-]{2,4}$";
 var regex = new RegExp(emailRegExp);
 return regex.test(email);
}