F.eks.
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "
http://www.w3.org/TR/html4/loose.dtd"><html>
<head>
<title>Vis sum</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style type="text/css">
html,body{height:100%;margin:0px;border:0px;padding:0px;font-family:tahoma,verdana,arial,sans-serif;font-size:small;}
input{text-align:right;}
</style>
<script language="javascript" type="text/javascript">
function sum(elm){
var f = elm.form, num = 1, ialt = 0, akt;
while(f.elements["udg" + num]){
akt = f.elements["udg" + num++].value;
akt = akt.match(/[^\d.,]/g) ? 0 : akt.replace(/,/g,".");
ialt += +akt;
}
f.Total.value = ialt;
}
</script>
</head>
<body>
<form id="minForm" name="minForm">
<table>
<tr>
<td colspan="2" style="text-align:center;font-weight:900;">Faste udgifter</td>
</tr>
<tr>
<td>Husleje: </td>
<td>
<input name="udg1" value="husleje" onfocus="if(this.value==this.defaultValue)this.value='';" onblur="if(this.value=='')this.value=this.defaultValue;sum(this);" onkeyup="this.value=this.value.replace(/[^\d.,]/g,'');"></td>
</tr>
<tr>
<td>Telefon: </td>
<td>
<input name="udg2" value="telefon" onfocus="if(this.value==this.defaultValue)this.value='';" onblur="if(this.value=='')this.value=this.defaultValue;sum(this);" onkeyup="this.value=this.value.replace(/[^\d.,]/g,'');"></td>
</tr>
<tr>
<td>Internet: </td>
<td>
<input name="udg3" value="internet" onfocus="if(this.value==this.defaultValue)this.value='';" onblur="if(this.value=='')this.value=this.defaultValue;sum(this);" onkeyup="this.value=this.value.replace(/[^\d.,]/g,'');"></td>
</tr>
<tr>
<td>Noget 4.: </td>
<td>
<input name="udg4" value="noget 4." onfocus="if(this.value==this.defaultValue)this.value='';" onblur="if(this.value=='')this.value=this.defaultValue;sum(this);" onkeyup="this.value=this.value.replace(/[^\d.,]/g,'');"></td>
</tr>
<tr>
<td>Noget 5.: </td>
<td>
<input name="udg5" value="noget 5." onfocus="if(this.value==this.defaultValue)this.value='';" onblur="if(this.value=='')this.value=this.defaultValue;sum(this);" onkeyup="this.value=this.value.replace(/[^\d.,]/g,'');"></td>
</tr>
<tr>
<td>Total: </td>
<td>
<input name="Total" value="0.00" disabled="disabled"></td>
</tr>
</table>
</form>
</body>
</html>
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