function change_news_photo(image_src){
	var newImage = "url("+image_src+")";
	document.getElementById('main_news_image').style.backgroundImage = newImage;
}


function show_send_friend(){
	$("#send_friend").dialog("open");
}

function send_friend_submit(){
	var err = false;
    var info = '';
    var url = $('#url').val();
	var sender_email = $('#sender_email').val();
    var sender_name = $('#sender_name').val();
    var friend_email = $('#friend_email').val();
    var friend_name = $('#friend_name').val();
    var message = $('#message').val();
    
    if(url==''){
       info = 'Niepoprawny adres polecanej strony!<br /><br />';
        err = true;     
    }
    
    if(sender_email==''){
	    info = 'Nie wprowadziłaś swojego adresu email!<br /><br />';
        err = true; 
    } else 
    if(!validate_email(sender_email)){
    	info = 'Twój adres email jest niepoprawny!<br /><br />';
        err = true;        
    }
    
    if(friend_email==''){
	    info = 'Nie wprowadziłaś adresu email znajomego!<br /><br />';
        err = true; 
    } else 
    if(!validate_email(friend_email)){
    	info = 'Adres email znajomego jest niepoprawny<br /><br />';
        err = true;        
    }
        
    if(!err){
    
        $('#modal_err').html('<img src=\"http://www.castrolprofessionalacademy.pl/img/preloader16.gif\" border=\"0\" />');
        jQuery.ajax({
            type: "POST",
            url: 'http://www.castrolprofessionalacademy.pl/ajax_send_friend_submit.php',
            data: "url="+url+"&sender_email="+sender_email+"&sender_name="+sender_name+"&friend_email="+friend_email+"&friend_name="+friend_name+"&message="+message,
            success: function(msg){
                
           		$('#modal_err').html(msg);     
                
            }
        });
    }else{
    	$('#modal_err').html(info);
    }        
}

function go_to_url(url){
	document.location.href= url;
}

function validate_email(t) {
  maska = /^[0-9a-z_.-]+@([0-9a-z-]+.)+[a-z]{2,4}$/;
  if (maska.test(t)==false) { 
    return false;
  }
  return true;
}


function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}