function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

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

function MM_findObj(n, d) { //v3.0
  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=MM_findObj(n,d.layers[i].document); return x;
}

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

function preloadImages(){
    MM_preloadImages('images/img-bg-blue-ovr.gif','images/img-bg-green-ovr.gif','images/img-bg-orange-ovr.gif','images/img-bg-purple-ovr.gif');
}

function tracker(trackerurl,trackersite,trackerpage,trackerdata){
    document.write("<img height='1' width='1' src='" + trackerurl + "/site.asp?site=" + trackersite + "&amp;page=" + trackerpage + "&amp;data=" + trackerdata + "&amp;img=no&amp;ref="+escape(document.referrer)+"' alt='' />");
}

function viewarticle(ref) {
	window.open('http://notrenet.ndhs.org.uk/article.asp?reference='+ref,'article'+ref,'width=750,height=520,left=5,top=5,resizable=1,scrollbars=yes,toolbar=yes,location=yes,menubar=yes');
}

var lhs = "unsubscribe";
var rhs = "shapingthefuture.org.uk";

function print_mail_to_link() 
{
   document.write("<a href=\"mailto");
   document.write(":" + lhs + "@");
   document.write(rhs + "\">" + lhs + "@" + rhs + "<\/a>");
}

function checkdate(objName)
{
    var datefield = objName;
    if (chkdate(objName) == false)
    {
        datefield.select();
        alert("That date is invalid.  Please try again.");
        datefield.focus();
        return false;
    }
    else
    {
        return true;
    }
}

function chkdate(objName)
{
    //var strDatestyle = "US"; //United States date style
    var strDatestyle = "EU";  //European date style
    var strDate;
    var strDateArray;
    var strDay;
    var strMonth;
    var strYear;
    var intday;
    var intMonth;
    var intYear;
    var booFound = false;
    var datefield = objName;
    var strSeparatorArray = new Array("-"," ","/",".");
    var intElementNr;
    var err = 0;
    var strMonthArray = new Array(12);
    strMonthArray[0] = "Jan";
    strMonthArray[1] = "Feb";
    strMonthArray[2] = "Mar";
    strMonthArray[3] = "Apr";
    strMonthArray[4] = "May";
    strMonthArray[5] = "Jun";
    strMonthArray[6] = "Jul";
    strMonthArray[7] = "Aug";
    strMonthArray[8] = "Sep";
    strMonthArray[9] = "Oct";
    strMonthArray[10] = "Nov";
    strMonthArray[11] = "Dec";
    strDate = datefield.value;
    if (strDate.length < 1)
    {
        return true;
    }
    
    for (intElementNr = 0; intElementNr < strSeparatorArray.length; intElementNr++)
    {
        if (strDate.indexOf(strSeparatorArray[intElementNr]) != -1)
        {
            strDateArray = strDate.split(strSeparatorArray[intElementNr]);
            if (strDateArray.length != 3)
            {
                err = 1;
                return false;
            }
            else
            {
                strDay = strDateArray[0];
                strMonth = strDateArray[1];
                strYear = strDateArray[2];
            }
            booFound = true;
        }
    }
    
    if (booFound == false)
    {
        if (strDate.length>5)
        {
            strDay = strDate.substr(0, 2);
            strMonth = strDate.substr(2, 2);
            strYear = strDate.substr(4);
        }
    }
    
    if (strYear)
    {    
        if (strYear.length == 2)
        {
            strYear = '20' + strYear;
        }
        
        if (strYear.length > 4)
        {
            alert("That date is invalid.  Please try again.");
        }
    }
    else
    
    {
        return false;
    }
    
    
    // US style
    if (strDatestyle == "US")
    {
        strTemp = strDay;
        strDay = strMonth;
        strMonth = strTemp;
    }
    
    intday = parseInt(strDay, 10);
    if (isNaN(intday))
    {
        err = 2;
        return false;
    }
    
    intMonth = parseInt(strMonth, 10);
    if (isNaN(intMonth))
    {
        for (i = 0;i<12;i++)
        {
            if (strMonth.toUpperCase() == strMonthArray[i].toUpperCase())
            {
                intMonth = i+1;
                strMonth = strMonthArray[i];
                i = 12;
            }
        }
        if (isNaN(intMonth))
        {
            err = 3;
            return false;
        }
    }
    intYear = parseInt(strYear, 10);
    if (isNaN(intYear))
    {
        err = 4;
        return false;
    }

    if (intMonth>12 || intMonth<1)
    {
        err = 5;
        return false;
    }
    
    if ((intMonth == 1 || intMonth == 3 || intMonth == 5 || intMonth == 7 || intMonth == 8 || intMonth == 10 || intMonth == 12) && (intday > 31 || intday < 1))
    {
        err = 6;
        return false;
    }
    if ((intMonth == 4 || intMonth == 6 || intMonth == 9 || intMonth == 11) && (intday > 30 || intday < 1))
    {
        err = 7;
        return false;
    }
    if (intMonth == 2)
    {
        if (intday < 1)
        {
            err = 8;
            return false;
        }
        if (LeapYear(intYear) == true)
        {
            if (intday > 29)
            {
                err = 9;
                return false;
            }
        }
        else
        {
            if (intday > 28)
            {
                err = 10;
                return false;
            }
        }
    }
    if (strDatestyle == "US")
    {
        datefield.value = strMonthArray[intMonth-1] + " " + intday+" " + strYear;
    }
    else
    {
        datefield.value = intday + " " + strMonthArray[intMonth-1] + " " + strYear;
    }
    return true;
}

function LeapYear(intYear)
{
    if (intYear % 100 == 0)
    {
        if (intYear % 400 == 0)
        {
            return true;
        }
    }
    else
    {
        if ((intYear % 4) == 0)
        {
            return true;
        }
    }
    return false;
}

function doDateCheck(from, to)
{
    if (Date.parse(from.value) <= Date.parse(to.value))
    {
        return '';
    }
    else
    {
        if (from.value == "" || to.value == "")
        {
            return 'Both dates must be entered.';
        }
        else 
        {
            return 'The \'To Date\' must occur after the \'From Date\'.';
        }   
   }
}