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var form = $('#contactForm');
  form.submit(function(event) {
      $.ajax({
          type: form.attr('method'),
          url: form.attr('action'),
          data: form.serialize(),
          success: function (data) {
              alert('ok');
          }
      });

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$(document).ajaxStart(function() {
   $("#loading_indicator").show();
 }).ajaxStop(function(){
   $("#loading_indicator").hide();
 });

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<script>
function toggle_visibility(id) {
 var e = document.getElementById(id);
 if(e.style.display == 'block')
    e.style.display = 'none';
 else
    e.style.display = 'block';
}

function show(id) {

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var sheet = (function() {
  // Create the <style> tag
	var style = document.createElement("style");

	// Add a media (and/or media query) here if you'd like!
	// style.setAttribute("media", "screen")
	// style.setAttribute("media", "@media only screen and (max-width : 1024px)")

	// WebKit hack :(
	style.appendChild(document.createTextNode(""));

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var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;

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//get cookie
function getCookie( name ) {  
	var start = document.cookie.indexOf( name + "=" );
	var len = start + name.length + 1;
	if ( ( !start ) && ( name != document.cookie.substring( 0, name.length ) ) ) {
		return null;
	}
	if ( start == -1 ) return null;
	var end = document.cookie.indexOf( ';', len );
	if ( end == -1 ) end = document.cookie.length;

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// Retrieve current URL
var url = document.URL;

// Retrieve current root URL
var root = location.protocol + '//' + location.host;

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jQuery.fn.center = function () {
    this.css("position","absolute");
    this.css("top", ( $(window).height() - this.height() ) / 2+$(window).scrollTop() + "px");
    this.css("left", ( $(window).width() - this.width() ) / 2+$(window).scrollLeft() + "px");
    return this;
}
 
//Use the above function as:
$(element).center();

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# Better each() for use with coffeescript
# 1. Wraps child in jquery object
# 2. Sets child first argument, so that fat-binding can be used.
# 3. Sets @ as well, for normal binds
jQuery.fn.loop = (block) ->
  for i in @
    element = jQuery(i)
    res = block.call element, element
    break if res == false

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@mixin font-size($font-size){
    font-size:$font-size +px;
    font-size:$font-size / $base-font-size +rem;
}