// Text fields
function clearField(instance,string) {
    if (instance.value==string) {
 		instance.value = '';
        
    }
}


// Validate email
function validateForm(objForm) {
    if (!document.getElementsByTagName || 
      !document.createElement || 
      !document.createTextNode)
    return false;
  
    if (!isEmail(objForm.email.value)) {
      if (document.getElementById('error'))
        return false;
  
	  var objContent = alert('Please enter a valid email address');
      return false;
    }else{
		alert('Thanks for your message.')
      return true;
    }
}
function isEmail(strValue) {
	var objRE = /^[\w-\.\']{1,}\@([\da-zA-Z-]{1,}\.){1,}[\da-zA-Z-]{2,}$/;
    return (strValue != '' && objRE.test(strValue));
}