<form name=rec>
<style>
button { width:100%; background-color:black; color: white; }
</style>
<table style="border:1 solid black" cellpadding=0 cellspacing=0>
<tr><td colspan=4 style="border-bottom:1 solid black">
<input type=text name=rek style="background:transparent; border:0" readonly></tr></td>
<tr>
<td><button onclick="rec.rek.value+='1'">1</button></td>
<td><button onclick="rec.rek.value+='2'">2</button></td>
<td><button onclick="rec.rek.value+='3'">3</button></td>
<td><button onclick="rec.rek.value+='+'">+</button></td>
</tr>
<tr>
<td><button onclick="rec.rek.value+='4'">4</button></td>
<td><button onclick="rec.rek.value+='5'">5</button></td>
<td><button onclick="rec.rek.value+='6'">6</button></td>
<td><button onclick="rec.rek.value+='/'">/</button></td>
</tr><tr>
<td><button onclick="rec.rek.value+='7'">7</button></td>
<td><button onclick="rec.rek.value+='8'">8</button></td>
<td><button onclick="rec.rek.value+='9'">9</button></td>
<td><button onclick="rec.rek.value+='*'">X</button></td>
</tr><tr>
<td><button onclick="rec.rek.value+='.'">.</button></td>
<td><button onclick="rec.rek.value+='0'">0</button></td>
<td><button value='=' onclick="som=eval(rec.rek.value); rec.rek.value=som;">=</button></td>
<td><button onclick="rec.rek.value+='-'">-</button></td>
</tr>
<tr>
<td colspan=2><button onclick="rec.rek.value=''">Wissen</button><td colspan=2>
<button onclick="alert('Rekenmachine gemaakt door Jacob Slomp\n http://jacob.slompinfo.nl')">Info</button>
</tr></td>
</form>
</table>