De code:

<form name = 'simpel' action = ''> <table border = '1' width = '150'> <tr><th colspan = '2'><input name = 'simpeldisplay' type = 'text' /></th></tr> <tr><th width = '25%'> <input type = 'button' onclick = 'document.simpel.simpeldisplay.value= ""' value = 'C' name = 'C' title = 'Clear' /> </th><th width = '75%'> <input type = 'button' style = 'width: 105px' onclick = 'document.simpel.simpeldisplay.value = eval(simpel.simpeldisplay.value);' value = '=' name = 'bereken' title = 'Bereken' /></th> </tr></table></form>