Kalkulačka 

 <FORM NAME="Calc"> <TABLE BORDER=4> <TR> <TD> <INPUT TYPE="text"   NAME="Input" Size="16"> <br> </TD> </TR> <TR> <TD> <INPUT TYPE="button" NAME="one"   VALUE="  1  " OnClick="Calc.Input.value += '1'"> <INPUT TYPE="button" NAME="two"   VALUE="  2  " OnCLick="Calc.Input.value += '2'"> <INPUT TYPE="button" NAME="three" VALUE="  3  " OnClick="Calc.Input.value += '3'"> <INPUT TYPE="button" NAME="plus"  VALUE="  +  " OnClick="Calc.Input.value += ' + '"> <br> <INPUT TYPE="button" NAME="four"  VALUE="  4  " OnClick="Calc.Input.value += '4'"> <INPUT TYPE="button" NAME="five"  VALUE="  5  " OnCLick="Calc.Input.value += '5'"> <INPUT TYPE="button" NAME="six"   VALUE="  6  " OnClick="Calc.Input.value += '6'"> <INPUT TYPE="button" NAME="minus" VALUE="  -  " OnClick="Calc.Input.value += ' - '"> <br> <INPUT TYPE="button" NAME="seven" VALUE="  7  " OnClick="Calc.Input.value += '7'"> <INPUT TYPE="button" NAME="eight" VALUE="  8  " OnCLick="Calc.Input.value += '8'"> <INPUT TYPE="button" NAME="nine"  VALUE="  9  " OnClick="Calc.Input.value += '9'"> <INPUT TYPE="button" NAME="times" VALUE="  x  " OnClick="Calc.Input.value += ' * '"> <br> <INPUT TYPE="button" NAME="clear" VALUE="  c  " OnClick="Calc.Input.value = ''"> <INPUT TYPE="button" NAME="zero"  VALUE="  0  " OnClick="Calc.Input.value += '0'"> <INPUT TYPE="button" NAME="DoIt"  VALUE="  =  " OnClick="Calc.Input.value = eval(Calc.Input.value)"> <INPUT TYPE="button" NAME="div"   VALUE="  /  " OnClick="Calc.Input.value += ' / '"> <br> </TD> </TR> </TABLE> </FORM>