function valid_contact()
{
	var form = document.contact;
	if(form.name.value=="")
	{
        alert("Please enter First Name");
		form.name.focus();
        return false;
    }
	else if(form.lastname.value=="")
	{
		alert("Please Enter Last Name.");
		form.lastname.focus();
		return false;
	}
	else if(form.address.value=="")
	{
		alert("Please Enter Your Address.");
		form.address.focus();
		return false;
	}
	else if(form.city.value=="")
	{
		alert("Please Enter your City.");
		form.city.focus();
		return false;
	}
	else if(form.state.value=="")
	{
		alert("Please Enter your State.");
		form.state.focus();
		return false;
	}
	else if((form.phone.value==null)||(form.phone.value==""))
	{
		alert("Please Enter Land Line Number.");
		form.phone.focus();
		return false;
	}
	else if (checkPhone(form.phone.value)==false){
		alert("Please enter a Valid Land Line Number")
		form.phone.focus()
		return false
	}
	else if(form.email.value=="")
	{
		alert("Please Enter Email ID.");
		form.email.focus();
		return false;
	}
	else if (! isValidEmail(form.email.value))
	{
        alert("Please enter a valid Email address");
		form.email.focus();
        return false;
    }
	else if((form.mobile.value==null)||(form.mobile.value==""))
	{
		alert("Please Enter Mobile Number.");
		form.mobile.focus();
		return false;
	}
	else if (checkMobile(form.mobile.value)==false){
		alert("Please enter a Valid Mobile Number")
		form.mobile.focus()
		return false
	}
	else if(form.comments.value=="")
	{
		alert("Please Enter your comments/enquiry.");
		form.comments.focus();
		return false;
	}
	else
	{
		return true;
	}
}

function isValidEmail(email, required) {
    if (required==undefined) {  
        required=true;
    }
    if (email==null) {
        if (required) {
            return false;
        }
        return true;
    }
    if (email.length==0) {  
        if (required) {
            return false;
        }
        return true;
    }
    if (! allValidChars(email)) { 
        return false;
    }
    if (email.indexOf("@") < 1) { 
        return false;
    } else if (email.lastIndexOf(".") <= email.indexOf("@")) {
        return false;
    } else if (email.indexOf("@") == email.length) {  
        return false;
    } else if (email.indexOf("..") >=0) {
	return false;
    } else if (email.indexOf(".") == email.length) { 
	return false;
    }
    return true;
}

function allValidChars(email) {
  var parsed = true;
  var validchars = "abcdefghijklmnopqrstuvwxyz0123456789@.-_";
  for (var i=0; i < email.length; i++) {
    var letter = email.charAt(i).toLowerCase();
    if (validchars.indexOf(letter) != -1)
      continue;
    parsed = false;
    break;
  }
  return parsed;
}
/* Phone No. Validation */
/* variables */	
	var digits = "0123456789";
	var phoneNumberDelimiters = "()- ";
	var validWorldPhoneChars = phoneNumberDelimiters + "+";
/* For the minimum digit */	
	var minDigitsInIPhoneNumber = 7;
	var mixDigitsInIPhoneNumber = 10;
function isInt(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++)
    {   
        // Check that current character isn't whitespace.
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}
function checkPhone(strPhone){
s=stripCharsInBag(strPhone,validWorldPhoneChars);
return (isInt(s) && s.length >= minDigitsInIPhoneNumber);
}
function checkMobile(strPhone){
s=stripCharsInBag(strPhone,validWorldPhoneChars);
return (isInt(s) && s.length >= mixDigitsInIPhoneNumber);
}