function swapImgRestore() { //v3.0
  var i,x,a=document.sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function preloadImages() {
  var d=document; 
  if(d.images){ 
    if(!d.p) 
      d.p=new Array();
    var i
    var j=d.p.length
    var a=preloadImages.arguments; 
    for(i=0; i<a.length; i++)
      if (a[i].indexOf("#")!=0) {
      d.p[j]=new Image; 
      d.p[j++].src=a[i];
    }
  }
}

function swapImage() { //v3.0
  var i,j=0,x,a=swapImage.arguments; document.sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=findObj(a[i]))!=null){document.sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

function findObj(n, d) { //v4.0
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=findObj(n,d.layers[i].document);
  if(!x && document.getElementById) x=document.getElementById(n); return x;
}

function isDate(dateStr)
{
  var datePat = /^(\d{1,2})(\/|-)(\d{1,2})(\/|-)(\d{4})$/;
  var matchArray = dateStr.match(datePat); // is the format ok?

  if (matchArray == null)
  {
    alert("Please enter date as either mm/dd/yyyy or mm-dd-yyyy.");
    return false;
  }

  month = matchArray[1]; // parse date into variables
  day = matchArray[3];
  year = matchArray[5];

  if (month < 1 || month > 12)  // check month range
  {
    alert("Month must be between 1 and 12.");
    return false;
  }

  if (day < 1 || day > 31)
  {
    alert("Day must be between 1 and 31.");
    return false;
  }

  if ((month==4 || month==6 || month==9 || month==11) && day==31)
  {
    alert("Month "+month+" doesn`t have 31 days!")
    return false;
  }

  if (month == 2) // check for february 29th
  {
    var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
    if (day > 29 || (day==29 && !isleap))
    {
      alert("February " + year + " doesn`t have " + day + " days!");
      return false;
    }
  }
  return true; // date is valid
}