// Check whether string s is empty.

function isEmpty(s)
{   //return ((s == null) || (s.length == 0))
	if ((s == null) || (s == ""))
		{
		return false;
		}
}


function doubleCheck(myForm, type) {

  for (i=0; i < myForm.elements.length; i++) {
  
	field = myForm.elements[i];

	
	if (field.name == "txtName")  {
		var status="";
		status = isEmpty(field.value);
		//alert('status is ' + status);
		if (status == false)
			{
			alert('Please fill in your name.');
			field.focus();
			return false;
			break;
			}
		}
		
		
	if (field.name == "txtCompany")  {
		var status="";
		status = isEmpty(field.value);
		//alert('status is ' + status);
		if (status == false)
			{
			alert('Please fill in your company name.');
			field.focus();
			return false;
			break;
			}
		}
		
		
	if (field.name == "txtEmail")  {
		var status="";
		status = isEmpty(field.value);
		//alert('status is ' + status);
		if (status == false)
			{
			alert('Please fill in your email address.');
			field.focus();
			return false;
			break;
			}
		}
		
	
	if (field.name == "txtPhone")  {
		var status="";
		status = isEmpty(field.value);
		//alert('status is ' + status);
		if (status == false)
			{
			alert('Please fill in your contact phone no.');
			field.focus();
			return false;
			break;
			}
		}
		
		
	if (field.name == "txtService")  {
		var status="";
		status = isEmpty(field.value);
		//alert('status is ' + status);
		if (status == false)
			{
			alert('Please fill in the service description.');
			field.focus();
			return false;
			break;
			}
		}
		
	}
	return true;
}