var fields = {
    title:null,
    description:null,
    dpcupimg_image:null,
    url:null,
    urltext:null,
    startdate:null,
    enddate:null,
    starttime:null,
    endtime:null,
    location:null,
    address:null,
    postnumber:null,
    postaddress:null,
    contact_name:null,
    contact_phone:null,
    contact_email:null    
};

function check_all_empty() {
    var allEmpty = true;

    for ( i in fields ) {
        item = jQuery( "[@name="+i+"]" );       
        fields[i] = item.val();
        if ( fields[i] != "" )
            allEmpty = false;
    }
    
    return allEmpty;
}

var dpcal_form_incomplete = false;

function preventunload() {
    if ( dpcal_form_incomplete && !check_all_empty() ) 
        return "Haluatko varmasti sulkea lomakkeen?";
        
}

window.onbeforeunload = preventunload;