function validate_contactus(frm)
{
	 var mobileNumber=frm.phone_mobile.value;
	if ( isEmpty(frm.name) )
	{
		alert("Please enter your name");
		frm.name.focus();
		return false;
	}
	if ( isEmpty(frm.email_id) )
	{
		alert("Please enter your mail id");
		frm.email_id.focus();
		return false;
	}
	if ( !isEmail(frm.email_id) )
	{
		alert("Please enter a valid email id");
		frm.email_id.focus();
		return false;
	}
	else if(checkInternationalPhone(mobileNumber)==false)
    {
		alert("Enter your contact number");
		frm.construct_cantact_txt.focus();
		return false;
    }
	if ( frm.mail_subject.value == "Other" )
	{
		if ( isEmpty(frm.mail_subject_other) )
		{
			alert("Please enter the subject");
			frm.mail_subject_other.focus();
			return false;
		}		
	}
	if (isEmpty(frm.mail_message))
	{
		alert("Please enter the message");
		frm.mail_message.focus();
		return false;
	}
	return true;
}
//----------------------------------------------------------------------------------------------------------------------------


/**
 * DHTML phone number validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */

// Declaring required variables
var digits = "0123456789";
// non-digit characters which are allowed in phone numbers
var phoneNumberDelimiters = "()- ";
// characters which are allowed in international phone numbers
// (a leading + is OK)
var validWorldPhoneChars = phoneNumberDelimiters + "+";
// Minimum no of digits in an international phone no.
var minDigitsInIPhoneNumber = 10;

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 trim(s)
{   var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not a whitespace, append to returnString.
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character isn't whitespace.
        var c = s.charAt(i);
        if (c != " ") returnString += c;
    }
    return returnString;
}
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++)
    {   
        // Check that current character isn't whitespace.
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function checkInternationalPhone(strPhone){
var bracket=3
strPhone=trim(strPhone)
if(strPhone.indexOf("+")>1) return false
if(strPhone.indexOf("-")!=-1)bracket=bracket+1
if(strPhone.indexOf("(")!=-1 && strPhone.indexOf("(")>bracket)return false
var brchr=strPhone.indexOf("(")
if(strPhone.indexOf("(")!=-1 && strPhone.charAt(brchr+2)!=")")return false
if(strPhone.indexOf("(")==-1 && strPhone.indexOf(")")!=-1)return false
s=stripCharsInBag(strPhone,validWorldPhoneChars);
return (isInteger(s) && s.length >= minDigitsInIPhoneNumber);
}