//-----------ukaz skry element id------------
function ukaz_skry(div_id) {
	var a=document.getElementById(div_id);
	
	if (a.style.display=="none") a.style.display="block"
	else a.style.display="none";
}


//-----------kontrola formulara------------
function checkForm()
{
   var cemail;
   
   cemail = window.document.emailform.tbEmail;

   if(!isEmail(cemail.value))
   {
      alert('E-mailová adresa nie je validná.');
      cemail.focus();
      return false;
   }
   else
   {
    return true;
   }
}


function checkForm2()
{
   var cemail,cfullname,ctext;
   
   cemail 	= window.document.kontaktform.tbEmailObch;
   cfullname 	= window.document.kontaktform.tbMenoPriezvisko;
   ctext 	= window.document.kontaktform.taText;

   if(trim(cfullname.value) == '')
   {
      alert('Prosím zadajte meno a priezvisko.');
      cfullname.focus();
      return false;
   }
   else if(!isEmail(cemail.value))
   {
      alert('E-mailová adresa nie je validná.');
      cemail.focus();
      return false;
   }
   else if(trim(ctext.value) == '')
   {
      alert('Prosím vyplňte text správy.');
      ctext.focus();
      return false;
   }
   else
   {
    return true;
   }
}



function trim(str)
{
   return str.replace(/^\s+|\s+$/g,'');
}




//------------overenie emailu-------------
	function isEmail(str)
	{
  	var regex = /^[-_.a-z0-9]+@(([-_a-z0-9]+\.)+(ad|ae|aero|af|ag|ai|al|am|an|ao|aq|ar|arpa|as|at|au|aw|az|ba|bb|bd|be|bf|bg|bh|bi|biz|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|com|coop|cr|cs|cu|cv|cx|cy|cz|de|dj|dk|dm|do|dz|ec|edu|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gh|gi|gl|gm|gn|gov|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|in|info|int|io|iq|ir|is|it|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|mg|mh|mil|mk|ml|mm|mn|mo|mp|mq|mr|ms|mt|mu|museum|mv|mw|mx|my|mz|na|name|nc|ne|net|nf|ng|ni|nl|no|np|nr|nt|nu|nz|om|org|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|pro|ps|pt|pw|py|qa|re|ro|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl|sm|sn|so|sr|st|su|sv|sy|sz|tc|td|tf|tg|th|tj|tk|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|um|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|yu|za|zm|zw)|(([0-9][0-9]?|[0-1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-5])\.){3}([0-9][0-9]?|[0-1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-5]))$/i;
		return regex.test(str);
	}


function wopen(url, name, height, width, str1) {
       var str = "height=" + height + ",innerHeight=" + height;
       str += ",width=" + width + ",innerWidth=" + width;
	   
	   str += ", "+str1;
	   
	   
       if (window.screen) {
         var ah = screen.availHeight - 30;
         var aw = screen.availWidth - 10;

         var xc = (aw - width) / 2;
         var yc = (ah - height) / 2;

         str += ",left=" + xc + ",screenX=" + xc;
         str += ",top=" + yc + ",screenY=" + yc;
       }
       var win=window.open(url, name, str);
	   win.focus();
	   return win;
}