function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;

function preloadImages() {
	if (document.images) {
		Products_over = newImage("images/Products-over.gif");
		Inquiries_over = newImage("images/Inquiries-over.gif");
		Quotations_over = newImage("images/Quotations-over.gif");
		PurchaseQuote_over = newImage("images/PurchaseQuote-over.gif");
		OrderTracking_over = newImage("images/OrderTracking-over.gif");
		Company_over = newImage("images/Company-over.gif");
		ContactUs_over = newImage("images/ContactUs-over.gif");
		Logout_over = newImage("images/Logout-over.gif");
		
		b_Products_over = newImage("images/b_Products-over.gif");
		b_Inquiries_over = newImage("images/b_Inquiries-over.gif");
		b_Quotations_over = newImage("images/b_Quotations-over.gif");
		b_PurchaseQuote_over = newImage("images/b_PurchaseQuote-over.gif");
		b_Company_over = newImage("images/b_Company-over.gif");
		b_ContactUs_over = newImage("images/b_ContactUs-over.gif");
		b_Logout_over = newImage("images/b_Logout-over.gif");
		
		c_Products_over = newImage("images/c_Products-over.gif");
		c_PurchaseQuote_over = newImage("images/c_PurchaseQuote-over.gif");
		c_Company_over = newImage("images/c_Company-over.gif");
		c_ContactUs_over = newImage("images/c_ContactUs-over.gif");
		c_Logout_over = newImage("images/c_Logout-over.gif");
		
		d_Products_over = newImage("images/d_Products-over.gif");
		d_PurchaseQuote_over = newImage("images/d_PurchaseQuote-over.gif");
		d_Company_over = newImage("images/d_Company-over.gif");
		
		e_Products_over = newImage("images/e_Products-over.gif");
		e_Company_over = newImage("images/e_Company-over.gif");
		e_ContactUs_over = newImage("images/e_ContactUs-over.gif");
		e_Login_over = newImage("images/e_Login-over.gif");

		preloadFlag = true;
	}
}

function CheckFields(){
	var errmsg;
	var errflg;
	errmsg = "";
	if (document.signon.userid.value.length == 0){
		errflg = true;
		errmsg = errmsg + "Missing or invalid User Name.\n";
	}
	if (document.signon.password.value.length == 0){
		errflg = true;
		errmsg = errmsg + "Missing or invalid Password.\n";
	}
	
	if (errflg){
		alert("Error!\n\n" + errmsg);
		return false;
	}else{
		return true;
	}
}

var dtCh= "/";
var minYear=1900;
var maxYear=2100;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        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(m, d, y){
	dtStr = m + "/" + d + "/" + y;
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strMonth=dtStr.substring(0,pos1)
	var strDay=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){
		//alert("The date format should be : mm/dd/yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		//alert("Please enter a valid month")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		//alert("Please enter a valid day")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		//alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		//alert("Please enter a valid date")
		return false
	}
	return true
}

/*function ValidateForm(){
	var dt=document.frmSample.txtDate
	if (isDate(dt.value)==false){
		dt.focus()
		return false
	}
    return true
}*/