function resize(){  
			var frame = document.getElementById("fade");

			if  (document.getElementById('html').scrollHeight>900)
			var htmlheight = document.getElementById('html').scrollHeight;
			else
			var htmlheight = 900;
			frame.style.height = htmlheight + "px"; 

		} 
		
		
function resize2(){  
			var frame = document.getElementById("fade");

			if  (document.getElementById('html').scrollHeight>900)
			var htmlheight = document.getElementById('html').scrollHeight+300;
			else
			var htmlheight = 900+300;
			frame.style.height = htmlheight + "px";  
		} 
		
		
function rozwin(){
    if(document.getElementById('more').innerHTML=='zwiń listę' || document.getElementById('more').innerHTML=='<a>zwiń listę</a>'){
        document.getElementById('more').innerHTML='pokaż wszystkie';
        document.getElementById('categorymenushort').style.height='240px';
    }else{    
        document.getElementById('more').innerHTML='zwiń listę';
        document.getElementById('categorymenushort').style.height='auto';
    };
};



function makeNext()
						{
						 if (window.autoChange==undefined)
							window.autoChange=0;
						      else
							    window.autoChange++;
						 if (window.autoChange==3)
							window.autoChange=0;
						 exp(window.autoChange);
						}




function makeVisible(id)
						{
					 	  
						 
						 	{
	 			if ( document.getElementById(id).style.display=='none' )
		document.getElementById(id).style.display='block';
            else     		
	           document.getElementById(id).style.display='none';
    }	
						
						}					

function changeCont() {

if ( document.getElementById('cont1').style.display=='none' ) {
		document.getElementById(cont1).style.display='block';
		document.getElementById(cont2).style.display='none'; }
            else     {		
	           document.getElementById(cont2).style.display='block';
		   document.getElementById(cont1).style.display='none';	
}

}

function exp(nr)
						{
					 	 divs=['dorm1', 'dorm2', 'dorm3'];
						 
						 var str=divs[nr];
						 window.autoChange=nr;
						 
						 document.getElementById('dorm1').style.display='none';
						 document.getElementById('dorm2').style.display='none';   
						 document.getElementById('dorm3').style.display='none';   
						 
						 document.getElementById(str).style.display='block';
						}

						

function isValidEmail(str) 
				{
				 return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);
				}
	

			function chck_contact_form()
				{				  
					alert('start');
					
					var errMsg='';
				   if (!isValidEmail(document.getElementById('email').value ) )
						{
						 document.getElementById('validatorEmail').innerHTML='Podany adres email jest nieprawidłowy';
						 document.getElementById('email').className = "txtfieldValid";
						  errMsg+=' ';
						}
					 else
					 {
						document.getElementById('validatorEmail').innerHTML = "";
						document.getElementById('email').className = "txtfield";
					 }
				 
				 if (document.getElementById('name').value=='')
					{
				     document.getElementById('validatorName').innerHTML='Proszę podać imię';
				     document.getElementById('name').className = "txtfieldValid";
					errMsg+=' ';
					}
					else
					{
						document.getElementById('validatorName').innerHTML = "";
						document.getElementById('name').className = "txtfield";
					}
					
				if (document.getElementById('topic').value=='')
					{
				     document.getElementById('validatorTopic').innerHTML='Proszę podać temat wiadomo¶ci';
					 document.getElementById('topic').className = "txtfieldValid";
					 errMsg+=' ';
					}
					else
					{
						document.getElementById('validatorTopic').innerHTML = "";
						document.getElementById('topic').className = "txtfield";
					}
					
				if (document.getElementById('msg').value=='')
					{
				     document.getElementById('validatorMsg').innerHTML='Proszę wpisać tre¶ć wiadomo¶ci';
					 document.getElementById('msg').className = "msgfieldValid";
					 errMsg+=' ';
					}			
					else
					{
						document.getElementById('validatorMsg').innerHTML = "";
						document.getElementById('msg').className = "msgfield";
					}
				  
				 
				 if (errMsg != '') {
        			 return false;				
					}
				else {

         		return true;

			}
				}