var dtCh= "/";
var minYear=2007;
var maxYear=2100;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
       var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}

function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strDay=dtStr.substring(0,pos1)
	var strMonth=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		return false
	}
return true
}

function echeck(str)
{
	var at="@"
	var dot="."
	var lat=str.indexOf(at)
	var lstr=str.length
	var ldot=str.indexOf(dot)
	if (str.indexOf(at)==-1){
	   return false
	}

	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
	   return false
	}

	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		return false
	}

	 if (str.indexOf(at,(lat+1))!=-1){
		return false
	 }

	 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		return false
	 }

	 if (str.indexOf(dot,(lat+2))==-1){
		return false
	 }
	
	 if (str.indexOf(" ")!=-1){
		return false
	 }

	 return true					
}

function encodeMyHtml(textToEncode)
{
	encodedHtml = escape(textToEncode);
	encodedHtml = encodedHtml.replace(/\//g,"%2F");
	encodedHtml = encodedHtml.replace(/\?/g,"%3F");
	encodedHtml = encodedHtml.replace(/=/g,"%3D");
	encodedHtml = encodedHtml.replace(/&/g,"%26");
	encodedHtml = encodedHtml.replace(/@/g,"%40");
	return encodedHtml;
} 

function cursorOver() {
    document.body.style.cursor = 'pointer';
}

function cursorClear() {
    document.body.style.cursor = 'default';
}

function openWindow(popupURL,popupWidth,popupHeight)
{
	var width  = popupWidth;
	var height = popupHeight;
	var left   = (screen.width  - width)/2;
	var top    = (screen.height - height)/2;
	var params = 'width='+width+', height='+height;
	params += ', top='+top+', left='+left;
	params += ', directories=no';
	params += ', location=no';
	params += ', menubar=no';
	params += ', resizable=yes';
	params += ', scrollbars=yes';
	params += ', status=no';
	params += ', toolbar=no';
	newwin = window.open(popupURL,'popupWindow', params);
	if (window.focus) {newwin.focus()}
	return false;			
}

function navWork(divID)
{
	var elem = document.getElementById(divID);
	elem.style = '';
}

function clearText(thefield)
{
	if (thefield.defaultValue==thefield.value) thefield.value = "";
} 

function setPrice(colourPrice)
{
	var ddnSize = document.getElementById('ddnSize').options[document.getElementById('ddnSize').selectedIndex].value;
	var ddnColour = document.getElementById('ddnColour').options[document.getElementById('ddnColour').selectedIndex].value;
	var itemPrice = document.getElementById('itemPrice');
	var txtPrice = document.getElementById('txtPrice');
	
	if(ddnColour == "")
	{
		itemPrice.innerHTML = ddnSize.substring(ddnSize.indexOf("#")+1);
	}else
	{
		priceToPay = (parseFloat(ddnSize.substring(ddnSize.indexOf("#")+1)) + parseFloat(colourPrice)).toFixed(2);
		itemPrice.innerHTML = priceToPay;
		txtPrice.value = priceToPay;
	}
}

function changeProductImage(imageName)
{
	var miniImage = document.getElementById(imageName);
	var mainImage = document.getElementById('mainProductImage');
	
	mainImage.src = miniImage.src.replace('small','large');
}