/* Functions for Rolloverimages
 *  generated by Macromedia Dreamwaver */
function MM_swapImgRestore() {
  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() {
  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) {
  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() {
  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];}
}


/* ----------------------------------------------------------------------------------------------
 * Functions for make elements visible/invisible
 *  by Norbert Groissboeck */
function makeVisible(id) {
	document.getElementById(id).style.display="";
}
function makeInvisible(id) {
	document.getElementById(id).style.display="none";
}

// ----------------------------------------------------------------------------------------------

function makeJavaScriptRequestInvisible() {
	makeInvisible("JavaScriptRequest");
}
function openImpressum() {
	window.open("impressum.html", "Impressum", "height=180, width=350, resizable=no, menubar=no, scrollbars=no, status=no, tollbar=no");
}
function openBuyOption(whichOne) {
	if (whichOne == 0) {
	  window.open("whereToBuy.php?title=Rechtschreibung", "Impressum", "height=250, width=400, resizable=no, menubar=no, scrollbars=no, status=no, tollbar=no");
	} else if (whichOne == 1) {
	  window.open("whereToBuy.php?title=Grammatik I", "Impressum", "height=250, width=400, resizable=no, menubar=no, scrollbars=no, status=no, tollbar=no");
	} else if (whichOne == 2) {
	  window.open("whereToBuy.php?title=Grammatik II", "Impressum", "height=250, width=400, resizable=no, menubar=no, scrollbars=no, status=no, tollbar=no");
	} else if (whichOne == 3) {
	  window.open("whereToBuy.php?title=Grammatik III", "Impressum", "height=250, width=400, resizable=no, menubar=no, scrollbars=no, status=no, tollbar=no");
	} 
}
function makeForumAndMailVisible() {
	makeVisible("forum_menu");
	makeVisible("mail_menu");
}
function makeForumAndMailInvisible() {
	makeInvisible("forum_menu");
	makeInvisible("mail_menu");
}