function AREA_MEASURES(){
this.mSquare_kilometer=(1000*1000)
this.mHectare=(100*100)
this.mAre=100
this.mSquare_meter=1
this.mSquare_decimeter=(0.1*0.1)
this.mSquare_centimeter=(0.01*0.01)
this.mSquare_millimeter=(0.001*0.001)
this.engSquare_foot=(0.3048*0.3048)
this.engSquare_yard=(3*3*this.engSquare_foot)
this.usSquare_rod=(16.5*16.5*this.engSquare_foot)
this.engAcre=160*this.usSquare_rod
this.engSquare_mile=(5280*5280*this.engSquare_foot)
this.engSquare_inch=(this.engSquare_foot/(12*12))}
var area_data=new AREA_MEASURES()
function checkNum(str){
for(var i=0;i"9")){
alert("Please enter a valid number.")
return false}}
return true}
function normalize(what,digits){
var str=""+what
var pp=Math.max(str.lastIndexOf("+"),str.lastIndexOf("-"))
var idot=str.indexOf(".")
if(idot>=1){
var ee=(pp>0)?str.substring(pp-1,str.length):""
digits+=idot
if(digits>=str.length)
return str
if(pp>0&&digits>=pp)
digits-=pp
var c=eval(str.charAt(digits))
var ipos=digits-1
if(c>=5){
while(str.charAt(ipos)=="9")
ipos--
if(str.charAt(ipos)=="."){
var nc=eval(str.substring(0,idot))+1
if(nc==10&&ee.length>0){
nc=1
ee="e"+(eval(ee.substring(1,ee.length))+1)}
return ""+nc+ee}
return str.substring(0,ipos)+(eval(str.charAt(ipos))+1)+ee}
else
var ret=str.substring(0,digits)+ee
for(var i=0;i"0"&&ret.charAt(i)<="9")
return ret
return str}
return str}
function compute(obj,val,data){
if(obj[val].value){
var uval=0
uval=obj[val].value*data[val]
if((uval>=0)&&(obj[val].value.indexOf("-")!=-1)){
uval=-uval}
for(var i in data)
obj[i].value=normalize(uval/data[i],8)}}
function resetValues(form,data){
for(var i in data)
form[i].value=""}
function resetAll(form){
resetValues(form,area_data)}
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