function trim(str, chars) {
    return ltrim(rtrim(str, chars), chars);
}
 
function ltrim(str, chars) {
    chars = chars || "\\s";
    return str.replace(new RegExp("^[" + chars + "]+", "g"), "");
}
 
function rtrim(str, chars) {
    chars = chars || "\\s";
    return str.replace(new RegExp("[" + chars + "]+$", "g"), "");
}


function checkemail1(email)
{
    var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-\-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i;
    if (filter.test(email))
    {
	return true;
    }
    else
    {
	alert("Please input a valid email address!\n");
	return false; 
    }
}

function checkemail(email)
{
    var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i;
    if (filter.test(email))
    {
	return '';
    }
    else
    {
	return "Please input a valid email address!\n";
    }
}
function form_submit(form)
{
    var error = '';
    var required;
    var filter=/,/;

    if (filter.test(form.required.value))
    {
	required = form.required.value.split(',');
    }
    else
    {
        for (var i = 0; i < form.required.length; i ++)
	{
	    required[i] = form.required[i].value;
	}
    }

    for (var i = 0; i < required.length; i ++)
    {
	var rname = required[i];
	
	var n = -1;
	for (var j = 0; j < form.elements.length; j ++)
	{
	    if (form.elements[j].name == rname)
	    {
		n = j;
		break;
	    }
	}
	
	if (n < 0) continue;
	
	var element = form.elements[n];
	
        var rv = 0;
	for (var j = 0; j < element.length; j ++)
	{
	    if (element[j].checked)
	    {
	        rv = 1;
	    }
	}
    element.value = trim(element.value);
	if (!element.value && !rv)
	{
	    var ename = rname.charAt(0).toUpperCase() + rname.substring(1, rname.length);
	    ename = ename.replace(/_/,' ');
	    error += ename + "\n";
	alert("Please enter "+ename);
	element.focus();
	return false;
	}
	else
	{
	    var f = /email/i;
	    if (f.test(rname))
	    {
		//error += checkemail(element.value);
		if(checkemail(element.value) != "")	
		{
		alert(checkemail(element.value));
		element.focus();
		return false;
		}
	    }
	    f = /(phone|fax)/i;
	    if (f.test(rname))
	    {
//	       error += checkphone(element.value);
		if(checkphone(element.value))
		{
		alert(checkphone(element.value));
		element.focus();
		return false;
		}

	    }
	}
    }
return true;

    if (trim(error)!= "")
    {
        alert('Please fill all required fields:\n \n'+error);
	return false;
    }


    return true;
}

function checkphone(val)
{


 if(val == "")	
 {
   return "Please enter phone number. \n";
 } else if(isNaN(val)) {
   return "Phone number should be numeric.\n";
 } else if(val.length < 10) {
   return "Please enter valid phone number.\n";
} else 
   return "";
}

///date validation code only validates mm/dd/yyyy format 

var dtCh= "/";
var d = new Date();
var minYear=d.getFullYear();
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(dtStr){
    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
 }