Jeg fik mingeleret lidt rundt så det passer til mit behov, her er den endelige løsning som jeg ville have den :)
Tak for hjælpen, det var et skub i den rigtige retning!
<SCRIPT>
var changeable = true;
function initier() {
if(document.all.txtLinkAddress.value == document.all.txtLinkName.value) {
changeable = true;
}
if(document.all.txtLinkAddress.value != document.all.txtLinkName.value) {
changeable = false;
}
}
function tjekType() {
if(document.all.txtLinkName.value == '') {
changeable = true;
}
if(changeable == true || document.all.txtLinkName.value == '') {
if (document.all.txtLinkType.selectedIndex==1) {
document.all.txtLinkName.value = document.all.txtLinkAddress.value;
}
}
}
function tjekType2() {
if(changeable == true || document.all.txtLinkName.value == '') {
if (document.all.txtLinkType.selectedIndex==1) {
if(document.all.txtLinkAddress.value!=document.all.txtLinkName.value) {
var changeable = false;
}
}
}
}
</SCRIPT>
<BODY id=bdy onload="initier();document.all.txtLinkAddress.focus();Init()" style="background: threedface; color: windowtext; BORDER-STYLE: none" scroll=no>
<table width="100%" border=1 cellspacing=6 cellpadding=0>
<tr><td nowrap>Link: </td><td><select name="txtLinkType" tabindex="0">
<option value="
http://">webadresse</option><option value="mailto:">email</option>
<option value="">intern fil</option>
</select></td><td style="width:100%"><INPUT type="text" onfocus="select();tjekType2()" onkeyup="tjekType()" onchange="tjekType()" style="width:100%" name="txtLinkAddress" tabindex="1"></td><td><BUTTON style="width:70px" type="button" onclick="btnOKClick()" tabindex="4">OK</BUTTON></td></tr>
<tr><td>Linknavn: </td><td colspan="2"><INPUT type="text" style="width:100%" name="txtLinkName" tabindex="2" onblur="initier()" onfocus="select()"></td><td><BUTTON style="width:70px" type="button" onClick="window.close();" tabindex="5">Annuler</BUTTON></td></tr>
<tr><td>Åbn i: </td><td colspan="2" width="100%"><SELECT style="width:100%" name="txtLinkTarget" tabindex="3">
<OPTION value="_blank">Nyt vindue</OPTION>
<OPTION value="_self" selected>Samme vindue</OPTION>
</SELECT>
</td></tr>
</table>