function changeTextSize(targetElem,inc)
{
	var p = document.getElementById(targetElem);
    p.style.fontSize = inc + 'pt';
}

function validate_required(field,alerttxt)
{
    with(field)
    {
        if (value==null||value=="")
            {alert(alerttxt);return false}
        else {return true}
    }
}
 
function validate_email(field,alerttxt)
{
  with(field)
  {
	 if (value.indexOf("@")==-1)
		{alert(alerttxt);return false}
	 else {return true}
  }
}

function form_submit()
{
  var x=document.forms[0]
  with(x)
  {
	 if (validate_required(txtName,"Name. Please type your name!")==false)
		{return false}

	 if (validate_required(txtPhone,"Name. Please type your phone!")==false)
		{return false}

	 if (validate_email(txtEmail,"Email. Please type a valid email!")==false)
		{return false}

	 if (validate_required(txtMessage,"Name. Please type your message!")==false)
		{return false}

	 submit()
  }
}