function tjekpostnr(entered, alertbox)
{
with (entered)
{
alen=value.length;

if (alen<4 || alen>4)
{if (alertbox) {alert(alertbox);} return false;}
else {return true;}
}
} 

function emailvalidation(entered, alertbox)
{
// E-mail Validation by Henrik Petersen / NetKontoret
// Explained at www.echoecho.com/jsforms.htm
// Please do not remove this line and the two lines above.
with (entered)
{
apos=value.indexOf("@"); 
dotpos=value.lastIndexOf(".");
lastpos=value.length-1;
if (apos<1 || dotpos-apos<2 || lastpos-dotpos>3 || lastpos-dotpos<2) 
{if (alertbox) {alert(alertbox);} return false;}
else {return true;}
}
} 

function emptyvalidation(entered, alertbox)
{
// Emptyfield Validation by Henrik Petersen / NetKontoret
// Explained at www.echoecho.com/jsforms.htm
// Please do not remove this line and the two lines above.
with (entered)
{
if (value==null || value=="")
{if (alertbox!="") {alert(alertbox);} return false;}
else {return true;}
}
} 

function makeachoise(entered, alertbox)
{
// Emptyfield Validation by Henrik Petersen / NetKontoret
// Explained at www.echoecho.com/jsforms.htm
// Please do not remove this line and the two lines above.
with (entered)
{
if (value==null || value=="")
{if (alertbox!="") {alert(alertbox);} return false;}
else {return true;}
}
} 

function emailverify(entered1, entered2, alertbox)
{
with (entered1)
{ email1 = value}
with (entered2)
{ email2 = value}

if (email1!=email2)
{if (alertbox!="") {alert(alertbox);} return false;}
else {return true;}
}
 
function valideringnykunde(thisform)
{
with (thisform)
{
if (emailvalidation(email,"Ugyldig E-mail adresse")==false) {email.focus(); return false;};
if (emailvalidation(email2,"Ugyldig E-mail adresse nr. 2")==false) {email2.focus(); return false;};
if (emailverify(email,email2,"De to e-mail adresser er forskellige!")==false) {email.focus(); return false;};
if (emptyvalidation(klub,"Klubnavn skal udfyldes")==false) {klub.focus(); return false;};
if (tjekpostnr(postnr,"Forkert post nummer")==false) {postnr.focus(); return false;};
if (makeachoise(koen,"Der skal vælges en holdsammensætning")==false) {koen.focus(); return false;};
if (makeachoise(sportsgren,"Der skal vælges en sportsgren")==false) {sportsgren.focus(); return false;};
if (makeachoise(alder,"Der skal vælges en række")==false) {alder.focus(); return false;};
if (makeachoise(hoertom,"Der skal vælges et felt")==false) {hoertom.focus(); return false;};

}
}