// JavaScript Document

function validate(form) // Define function checkme
{
	var allOK = true;

    if (form.txtName.value == "")
    {
	    alert("Please enter your name and surname.");
	    form.txtName.focus();
	    allOK = false;
	    return(false);
    }
	
 
    if (form.txtEmail.value == "")
    {
	    alert("Please provide an email address.");
	    form.txtEmail.focus();
	    allOK = false;
	    return(false);
    }
	
	   if (form.txtPhone.value == "")
    {
	    alert("Please provide a contact number.");
	    form.txtPhone.focus();
	    allOK = false;
	    return(false);
    }
	

    if (form.txtEnq.value == "")
    {
	    alert("You did not enter your enquiry. Please provide it.");
	    form.txtEnq.focus();
	    allOK = false;
	    return(false);
    }

//-------------------------------------------------------------------------------------
//Telephone Check
//-------------------------------------------------------------------------------------
    
//    if (form.Tel.value == "")
//    {
//	    alert("You did not enter your contact number. Please provide it.");
//	    form.Tel.focus();
//	    allOK = false;
//	    return(false);
//    }

	// only allow numbers to be entered
	var checkOK = "0123456789";
	var checkStr = form.txtPhone.value;
	var allValid = true;
	var allNum = "";
	for (i = 0;  i < checkStr.length;  i++)
	{
		ch = checkStr.charAt(i);
		for (j = 0;  j < checkOK.length;  j++)
		if (ch == checkOK.charAt(j))
		{
			break;
		}
		if (j == checkOK.length)
		{
			allValid = false;
			break;
		}
		if (ch != ",")
		allNum += ch;
	}
	if (!allValid)
	{
		alert("Please enter only digits in the \"Contact Number\" field.");
		form.txtPhone.focus();
	    allOK = false;
		return (false);
	}
	
	if ((form.txtEmail.value==null)||(form.txtEmail.value==""))
	{
		alert("Please enter your email address")
		form.txtEmail.focus()
	    allOK = false;
		return false
	}
	if (echeck(form.txtEmail.value)==false){
		form.txtEmail.value=""
		form.txtEmail.focus()
	    allOK = false;
		return false
	}
	
	if (form.txtEnq.value == "")
    {
	    alert("You did not enter an enquiry. Please provide it.");
	    form.txtName.focus();
	    allOK = false;
	    return(false);
    }

//-------------------------------------------------------------------------------------

	if (allOK==true)
	{
		form.submit();
	}
	
}

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 address")
		   return false
		}

		//@ sign at start or end of string
		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail address")
		   return false
		}

		//. (dot) at start or end of string
		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail address")
		    return false
		}

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

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

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

 		 return true					
	}