var old_i="";
var old_ID="";
var B;

if(navigator.appName=="Netscape"&&parseInt(navigator.appVersion)<5){B="NS";}else{B="IE";}
function m_i(ID,i){if(B!="NS"){d=document.images[ID];}else{d=document.images[ID];}old_ID=ID;old_i=d.src;d.src=i;}
function m_o(){if(old_ID!=""){if(B!="NS"){d=document.images[old_ID];}else{d=document.images[old_ID];}d.src=old_i;old_ID="";old_i="";}}

function testframeset(){
	if(self==top){
		f=window.location.href.replace(/\?/,"&");
		f=f.substr(f.lastIndexOf("/")+1);
		if(f.indexOf("top.php")==0 || f.indexOf("left.php")==0){
			document.location.href="index.php";
		}else{
			document.write("<hr width=\"90%\" /><div align=\"center\" class=\"fattext\">Diese Seite ist Teil eines Framesets<br><a href=\"index.php?p="+f+"\" class=\"lnk12\">im Framekontext anzeigen</a></div><hr width=\"90%\" />");
		}
	}
}


function nav_in(ID){
		a=document.images["n"+ID];
		b=document.images["n"+(ID-1)];
		c=document.images["n"+(ID+1)];
		
		if(ID!=(nav_current+2)){
			b.src="img/nav_l_o.gif";
		}else{
			b.src="img/nav_l_o2.gif";			
		}
		
		if(ID!=(nav_current-2)){
			c.src="img/nav_r_o.gif";
		}else{
			c.src="img/nav_r_o2.gif";
		}
		old_ID=ID;
		a.src=a.src.substr(0,a.src.length-5)+"r.gif";
}

function nav_out(){
		a=document.images["n"+old_ID];
		b=document.images["n"+(old_ID-1)];
		c=document.images["n"+(old_ID+1)];
		if(old_ID!=(nav_current+2)){
			b.src="img/nav_blank.gif";
		}else{
			b.src="img/nav_r.gif";			
		}
		
		if(old_ID!=(nav_current-2)){
			c.src="img/nav_blank.gif";
		}else{
			c.src="img/nav_l.gif";
		}
		a.src=a.src.substr(0,a.src.length-5)+"w.gif";
}

function suchen(){
	var ok=true;
	if(document.query.p.value=="suche.php"){
		if(document.query.qany.value.length<4){
			alert("Der Suchbegriff muss mindestens 4 Zeichen lang sein!");
			ok=false;
		}
	}else{
		if(document.query.qautor.value.length<3 && document.query.qtitel.value.length<3 && document.query.qisbn.value.length<3){
			alert("Bitte zumindest ein Suchkriterium eingeben! (mind. 3 Zeichen)");
			ok=false;
		}
	}
	if(ok)document.query.submit();	
}