function serializeCheckboxes(arr) {
  if(!arr.length) arr = [arr];
	var serial = "";

	for (var i = 0; i < arr.length; i++) {
		serial = serial + arr[i].value + ':' + arr[i].checked + ';';

	}

	return serial;
}
function SideMenuIn(nr) {
	document.getElementById('div'+nr).style.display='block';
}
function SideMenuOut(nr) {
	document.getElementById('div'+nr).style.display='none';
}
function ChoosePic(ImageID, fieldID) {
	document.getElementById(fieldID).value = ImageID;
	document.getElementById(fieldID+'_preview').innerHTML = '<img src="Images/dbpic.php?bild='+ImageID+'&thumb=1" alt="Förhandsvisning"/>';
}
function clearinput(formfield){
  if(formfield.defaultValue==formfield.value)
    formfield.value = "";
  else if(formfield.value == '')
    formfield.value = formfield.defaultValue;
}