function validEmail(emailField) {
  email = emailField.value
  if (email == "") {     //must contain something
    alert("Email address is empty")
    emailField.focus();
	return false
  }
  invalid = " /;,:"
  for (i=0; i<invalid.length; i++){   //cannot contain these characters
    bad = invalid.charAt(i)
    if (email.indexOf(bad,0) > -1){
      alert("Email address contains invalid characters")
      emailField.focus();
      return false
    }
  }
  atPos = email.indexOf("@",0)  //must have a @ character
  if (atPos == -1){
    alert("Email address is missing the @ character")
    emailField.focus();
    return false
  }
  if (atPos == 0){   //cannot start with @ character
    alert("Email address cannot start with the @ character")
    emailField.focus();
    return false
  }
  if (email.indexOf("@",atPos+1) != -1){  //can only have ONE @ character
    alert("Email address contains more than one @ character")
    emailField.focus();
    return false
  }
  dotPos = email.indexOf(".",atPos+1)  //must have a . character after the @
  if (dotPos == -1){
    alert("Email address must have a . character following the @ character")
    emailField.focus();
    return false
  }
  if (dotPos == 0){   //cannot start with . character
    alert("Email address cannot start with the . character")
    emailField.focus();
    return false
  }
  if ((dotPos-atPos) == 1){
    alert("Email address has no characters between the @ and . characters")
    emailField.focus();
    return false    
  }
  if (dotPos+3 > email.length){   //must have at least 2 characters after .
    alert("Email address must have at least two characters following the dot")
    emailField.focus();
    return false
  }        
}


function goBack()
{
  if (history.length > 0)
  {history.back()}
}


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_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_findObj(n, d) { //v4.01
  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);
  if(!x && d.getElementById) x=d.getElementById(n); 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 hideLayer() {
	var v;
	if(prevMenu!=null){
		obj=findObj(prevMenu)
		if (obj.style){
			obj=obj.style; v='hidden';
		}
		else{
			v='hide';
		}
		obj.visibility=v;
	}
	prevMenu = null;
}


function showLayer(layerNum) {
	var v;
	if(prevMenu!=null){
		obj=findObj(prevMenu)
		if (obj.style){
			obj=obj.style; v='hidden';
		}
		else{
			v='hide';
		}
		obj.visibility=v;
	}
	obj=findObj(layerNum)
	if (obj.style){
		obj=obj.style; v='visible';
	}
	else{
		v='show';
	}
	obj.visibility=v;
	prevMenu = layerNum;
}


function openWin(url,wn,w,h,l,t,s,r,tb){
	//alert('url='+url+',wn='+wn+',width='+w+',height='+h+',left='+l+',top='+t+',scrollbars='+s+',resizable='+r+',toolbar='+tb)
	newWindow = window.open(url,wn,'width='+w+',height='+h+',left='+l+',top='+t+',scrollbars='+s+',resizable='+r+',toolbar='+tb )
	newWindow.focus()
}


function isDate(dateStr){
	if (dateStr.length==0){alert("Please enter a date");return false;}
	
	if (dateStr.indexOf("-")!=-1){dateArray = dateStr.split("-")}
	else {dateArray = dateStr.split("/")}
	
	if (dateArray.length<2){alert("Date separators must be '-' or '/'");return false;}
	
	day		= dateArray[0];
	month	= dateArray[1];
	year	= dateArray[2];
	
	var monthNameArray	= new Array("Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec");

	if (isNaN(month)){
		// month is not a number
		monthName = month;
		found = false;
		for (i=0; i<monthNameArray.length; i++){
			if (month == monthNameArray[i]){
				monthNum = i+1;
				found=true;
			}
		}
		if (found==false){
			alert(monthName+" is not a valid month name");
			return false;
		}
	}
	else{
		monthNum = month;
		monthName = monthNameArray[month-1];
	}
	
	if (monthNum < 1 || monthNum > 12) { // check month range
		alert("Month must be between 1(Jan) and 12(Dec)");
		return false;
	}

	if ((monthNum==4 || monthNum==6 || monthNum==9 || monthNum==11) && day==31) {
		alert("Month "+monthName+" doesn't have 31 days!")
		return false;
	}

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

	if (monthNum == 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
}

function addToFavorites(){
	if (window.external){
		// if the browser is IE open the add favorite window
		external.AddFavorite(location.href,document.title)
	}
	else{
		alert("Sorry, your browser doesn't support this feature.\nPlease use the bookmark feature of your browser to save the location of this page.");
	}
}


function gallery(img){
	//var URL		= "viewer.htm?"+img.src+"|"+img.title;
	//openWin(URL,'viewer','650','500','100','60','yes','yes','no');
	var URL = img.src;
	openWin(URL,'viewer','600','500','100','60','yes','yes','no');
}