function sbg(){
	var buttons = document.getElementsByClassName('sbg-button')

	for(var i=0;i<buttons.length;i++){
		var button = buttons[i]

		if(button.hasAttribute('data-sbg-isBinded')){continue}
		button.setAttribute('data-sbg-isBinded','true')

		var network = button.getAttribute('data-sbg-network')

		bindButton(network,button)
	}

	function bindButton(network,button){
		var height = button.getAttribute('data-sbg-height')
			,width = button.getAttribute('data-sbg-width')
			,top = Math.max(0,(screen.height-height)/2)
			,left = Math.max(0,(screen.width-width)/2)
			,specs = 
				'height='+height+',width='+width+',top='+top+',left='+left
				+',status=0,toolbar=0,directories=0,location=0'
				+',menubar=0,resizable=1,scrollbars=1'
			,windowName = 'sbg-window-'+Math.random()

		switch(network){
			case 'facebook':
				var url = buildUrl('http://www.facebook.com/sharer.php',{
					's':100
					,'p[url]':button.getAttribute('data-sbg-url')
					,'p[title]':button.getAttribute('data-sbg-title')
					,'p[summary]':button.getAttribute('data-sbg-summary')
					,'p[images][0]':button.getAttribute('data-sbg-image')
				})
				button.onclick=function(){
					window.open(url,windowName,specs);
				}
				break;
			case 'twitter':
				var url = buildUrl('http://twitter.com/intent/tweet',{
					'text':button.getAttribute('data-sbg-text')
					,'via':button.getAttribute('data-sbg-via')
					,'hashtags':button.getAttribute('data-sbg-hashtags')
				})
				button.onclick=function(){
					window.open(url,windowName,specs);
				}
				break;
			case 'linkedin':
				var url = buildUrl('http://www.linkedin.com/shareArticle',{
					'mini':'true'
					,'url':button.getAttribute('data-sbg-url')
					,'title':button.getAttribute('data-sbg-title')
					,'source':button.getAttribute('data-sbg-source')
					,'summary':button.getAttribute('data-sbg-summary')
				})
				button.onclick=function(){
					window.open(url,windowName,specs);
				}
				break;
			case 'google-plus':
				var url = buildUrl(' https://plus.google.com/share',{
					'url':button.getAttribute('data-sbg-url')
				})
				button.onclick=function(){
					window.open(url,windowName,specs);
				}
				break;
			case 'pinterest':
				var url = buildUrl('http://www.pinterest.com/pin/create/button/',{
					'url':button.getAttribute('data-sbg-url')
					,'media':button.getAttribute('data-sbg-media')
					,'description':button.getAttribute('data-sbg-description')
				})
				button.onclick=function(){
					window.open(url,windowName,specs);
				}
				break;
			case 'email':
				var url = buildUrl('mailto:',{
					'su':button.getAttribute('data-sbg-subject')
					,'subject':button.getAttribute('data-sbg-subject')
					,'body':button.getAttribute('data-sbg-body')
				})
				button.setAttribute('href',url)
				break;

		}
	}

	function buildUrl(url, parameters){
	  var qs = "";
	  for(var key in parameters) {
	    var value = parameters[key];
	    if(!value){continue}
	   	value = value.toString().split('\"').join('"');
	    qs += key + "=" + encodeURIComponent(value) + "&";
	  }
	  if (qs.length > 0){
	    qs = qs.substring(0, qs.length-1); //chop off last "&"
	    url = url + "?" + qs;
	  }
	  return url;
	}

}