function validateZIP(field) {
var valid = "0123456789-";
var hyphencount = 0;

if (field.length!=5 && field.length!=10) {
return false;
}
for (var i=0; i < field.length; i++) {
temp = "" + field.substring(i, i+1);
if (temp == "-") hyphencount++;
if (valid.indexOf(temp) == "-1") {
return false;
}
if ((hyphencount > 1) || ((field.length==10) && ""+field.charAt(5)!="-")) {
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){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail ID")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail ID")
		    return false
		 }

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

 		 return true					
	}

function IsNumeric(sText)
{
   var ValidChars = "0123456789.";
   var IsNumber=true;
   var Char;

 
   for (i = 0; i < sText.length && IsNumber == true; i++) 
      { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
         {
         IsNumber = false;
         }
      }
   return IsNumber;
   
   }


function validate_form ( )
{
	valid = true;

        if ( (document.feedback.firstname.value) == "" )
        {
                alert ( "Please fill in your first name." );
                valid = false;
        }  

         else  if ( document.feedback.lastname.value == "" )
        {
                alert ( "Please fill in your last name." );
                valid = false;
        }
         else  if ( document.feedback.email.value == "" )
        {
                alert ( "Please fill in your email address." );
                valid = false;
        } else  if (echeck(document.feedback.email.value)==false)
        {
                alert ( "Please enter a valid email address." )
                valid = false;
        }


        else if ( document.feedback.message.value == "" )
        {
                alert ( "Please tell us what services you are interested in, in the message box?")
                valid = false;
        
        }
        



        return valid;
}