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<script language="JavaScript">
<!--
up=op=perval='';
dollar=10.11;
resetblock=1;
function calc (oper) {
with (document.calc) {
eval('up='+up+op+info.value);
if (op!='') info.value=up;
if (isNaN(up)) {
info.value='Error'; op='';up=''
}
resetblock=1;
}
}
function clno(value) {
with (document.calc)
if (value=='sign') {
if (!resetblock) {
temp=info.value.substr(0,1);
if (temp=='-') info.value=info.value.substr(1);
else if (temp=='+') info.value='-'+info.value.substr(1);
else info.value='-'+info.value;
}
}
else if (value=='rd') {
info.value=info.value/dollar;
if (isNaN(info.value)) {info.value='Error'; op='';up=''}
}
else if (value=='dr') {
info.value=dollar*info.value;
if (isNaN(info.value)) {info.value='Error'; op='';up=''}
}
else if (value=='clear') {
up=op='';
resetblock=1;
info.value='0';
}
else if (value=='ce') {
resetblock=1;
info.value='0';
}
else if (value=='+' || value=='-' || value=='*' || value=='/') {
if (op!='') calc(1);
else up=info.value;
op=value;
resetblock=1;
}
else if (value=='calc') {
calc(0);
up=op='';
}
else if ((value>='0' && value<='9') || (value=='.')) {
if (resetblock) info.value=value,resetblock=0;
else info.value=info.value+value;
}
}
function area(pos,value) {
document.write('<area shape="rect" coords="'+pos+'" alt="'+value+'" href="javascript:clno('+"'"+value+"'"+')">');
}
document.write('<form name="calc">');
document.write('<input name="info" type="text" size="15" maxlen="20" value="0" onfocus="preval=document.calc.info.value">');
document.write('<br>');
document.write('<img src="calc.gif" width="170" height="135" border="0" hspace="0" usemap="#calcpad" vspace="5">');
document.write('</form>');
document.write('<map name="calcpad">');
area("0,0,30,30","1");
area("35,0,65,30","2");
area("70,0,100,30","3");
area("105,0,135,30","/");
area("140,0,170,30","clear");
area("0,35,30,65","4");
area("35,35,65,65","5");
area("70,35,100,65","6");
area("105,35,135,65","*");
area("140,35,170,65","ce");
area("0,70,30,100","7");
area("35,70,65,100","8");
area("70,70,100,100","9");
area("105,70,135,100","-");
area("140,70,170,135","calc");
area("0,105,30,135","0");
area("35,105,65,135","sign");
area("70,105,100,135",".");
area("105,105,135,135","+");
document.write('');
//-->
</script>
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