function OpenBook(){
	var BookWindow;
	BookWindow = window.open(BasePath + 'includes/window-book.php?lang=' + Lang, '', 'width=800, height=350');
}
function OpenProjects(){
	var ProjectWindow;
	// ProjectWindow = window.open(BasePath + 'includes/window-project.php', '', 'width=360, height=632');
	ProjectWindow = window.open(BasePath + 'includes/window-map.php', '', 'width=800, height=500');
}
function check_i()
{
	var c = 0;
	if(document.getElementById('i_1').checked) ++c;
	if(document.getElementById('i_2').checked) ++c;
	if(document.getElementById('i_3').checked) ++c;
	if(document.getElementById('i_4').checked) ++c;
	if(c == 0) 
	{
		alert('Bitte wählen Sie Ihre Interessen aus!');
		return false;
	}
	return true;
}
function checkForm(formID)
{
	myForm = document.getElementById(formID);
	if (typeof(myForm) != "object") return false;
	myElements = myForm.elements;
	myError = new Array();
	for (f=0; f<myElements.length; f++){
	   myElement = myElements[f];
	   if (myElement.id.indexOf('_req') != -1){
		   // REQUIRED FIELD
		   if (myElement.id.indexOf('_em') != -1){
				   if(myElement.value == "" || myElement.value.indexOf('@') == -1 || myElement.value.lastIndexOf('.') <= myElement.value.indexOf('@')){
					   myError.push(myElement);
				   }
		   } else if (myElement.value == "" || (myElement.type == "checkbox" && myElement.checked != true)) {
			   myError.push(myElement);
		   }
	   }
	}
	if (myError.length > 0){
		alert("Bitte füllen Sie alle Pflichtfelder aus!");
		myError[0].focus();
		return false;
	} else { 
		return check_i();
	}
	return false;
}