function shareOnFacebook(share_title,share_url) {
    //encode the share_title
    t=encodeURIComponent(share_title);
    //encode the share_url
    u=encodeURIComponent(share_url);
    //determine the target url to open
    i=encodeURIComponent('http://srsnikh.coolweby.cz/images/logo.png');
	//determine the target url to open
	target_url='http://www.facebook.com/sharer.php?s=100&p[title]='+t+'&p[url]='+u+'&t='+t+'&p[images][0]='+i;
    //open the target
    window.open(target_url,'sharer','toolbar=0,status=0,width=600,height=400');
}