function check_params() {
  var fields = ['first_name', 'last_name','email','zipcode'];
  var valid = true;
  
  $('.error').hide();
  
  for(var f in fields){
    $('#contact_'+fields[f]).removeClass("failed");
    if($('#contact_'+fields[f]).val() == ""){
      $('.error#'+fields[f]).show();
      $('#contact_'+fields[f]).addClass("failed");
      valid = false;
    }    
  }
  
  var email = $('#contact_email').val();
  if((email.indexOf(".") < 1) || (email.indexOf("@") <= 0)){
    $('.error#email-valid').show();
    $('#contact_email').addClass("failed");
    valid=false;
  }
  return valid;
}

if($('#sent-dialog').length > 0){
  $('#sent-dialog').dialog({
    modal: true,
  	autoOpen: true,
  	width: 475,
  	height: 403,
  	resizable: false,
  	overlay: {
  		backgroundColor: '#000',
  		opacity: 0.5
  	}
  });
}

$('#signup-dialog').dialog({
  modal: true,
	autoOpen: false,
	width: 475,
	height: 403,
	resizable: false,
	overlay: {
		backgroundColor: '#000',
		opacity: 0.5
	}
});

if($('#coupon-dialog').length > 0){
  $('#coupon-dialog').dialog({
    modal: true,
  	autoOpen: true,
  	width: 475,
  	height: 403,
  	resizable: false,
  	overlay: {
  		backgroundColor: '#000',
  		opacity: 0.5
  	}
  });
}

if($('#emailed-dialog').length > 0){
  $('#emailed-dialog').dialog({
    modal: true,
  	autoOpen: true,
  	width: 475,
  	height: 403,
  	resizable: false,
  	overlay: {
  		backgroundColor: '#000',
  		opacity: 0.5
  	}
  });
}