function changeIt(newImg,Img) {
    document.images[Img].src = newImg;
    }

function isBrowserSupp() {
    // Get the version of the browser
    version =  parseFloat( navigator.appVersion );
 
    if ( ( version >= 2.0 ) && ( version < 2.1 ) && ( navigator.appName.indexOf( "Netscape" ) != -1 ) ) {
        return false;
    }
    else {
    return true;
    }
 
return true;
}
 
function isLeapYear(yrStr)
{
var leapYear=false;
var year = parseInt(yrStr, 10);
// every fourth year is a leap year
if (year%4 == 0)
    {
    leapYear=true;
    // unless it's a multiple of 100
    if (year%100 == 0)
        {
        leapYear=false;
        // unless it's a multiple of 400
        if (year%400 == 0)
            {
            leapYear=true;
            }
        }
    }
return leapYear;
}
 

function getDaysInMonth(mthIdx, YrStr)
{
// all the rest have 31
var maxDays=31
// expect Feb. (of course)
if (mthIdx==1)
    {
    if (isLeapYear(YrStr))
        {
        maxDays=29;
        }
    else
        {
        maxDays=28;
        }
    }
// thirty days hath...
if (mthIdx==3 || mthIdx==5 || mthIdx==8 || mthIdx==10)
    {
    maxDays=30;
    }
return maxDays;
}
 

//the function which does some magic to the date fields
// return non-zero if it is the last day of the month
function adjustDate(mthIdx, Dt)
{
var value=0;
 
var today = new Date()
var theYear = parseInt(today.getYear(),10)
 
if (mthIdx < today.getMonth()) {
    theYear = (parseInt(today.getYear(), 10) + 1)
}
if(theYear<100){
    theYear = "19" + theYear
}
else{
    if((theYear-100) < 10){
        theYear = "0" + (theYear-100)
    }
    else{
        theYear = (theYear-100)+""
    }
    theYear = "20" + theYear
}
 

var numDays=getDaysInMonth(mthIdx, theYear);
 
if (mthIdx==1)
    {
    if (Dt.options.selectedIndex + 1 < numDays)
        {
        return 0;
        }
    else
        {
        Dt.options.selectedIndex=numDays - 1;
        //check for leap year
        if (numDays==29)
            {
            return 99;
            }
        else
            {
            return 1;
            }
        }
    }
if (Dt.options.selectedIndex + 1 < numDays)
    {
    value=0;
    }
else
    {
    if (Dt.options.selectedIndex + 1 > numDays)
        {
        Dt.options.selectedIndex--;
        value=3;
        }
    else
        {
        //index is 31 or 30
        value=2;
        }
    }
return value;
}
 
//changes departure month when arrival month is changed
function amadChange(inM,inD,outM,outD)
{
if (!isBrowserSupp())
    {
    return;
    }
 
var res = adjustDate(inM.options.selectedIndex, inD);
if (res != 0)
    {
           outD.options.selectedIndex=0;
           if (outM.options.selectedIndex==11){
            outM.options.selectedIndex=0
           }
           else{
            outM.options.selectedIndex=inM.options.selectedIndex + 1;
           }
    }
else
    {
    outM.options.selectedIndex = inM.options.selectedIndex;
    outD.options.selectedIndex = inD.options.selectedIndex+1;
    }
return;
}
 
function dmddChange(outM,outD)
{
if (!isBrowserSupp())
    {
    return;
    }
 
adjustDate(outM.options.selectedIndex,outD);
return;
}
 
function newWindow(url)
{
urlWindow = window.open(url, 'AirportCodes', 'width=450,height=350');
urlWindow.focus;
}
 
function setRadioBtn (theForm,radioObjName,valOfBtnToSet) {
for (var i = 0; i < theForm[radioObjName].length; i++) {
if (theForm[radioObjName][i].value == valOfBtnToSet)
theForm[radioObjName][i].checked=true;
}
}
 
function reload_page()
{
newWin = window.location;
newWin.replace('power_search.cgi?src=10008451&clear_cache=Y');
}