How do you all a URL to pass thru json?

http:// is breaking it... im guessing its the // because if I remove one it works...

Code:
$('#save_social').click(function() {
                	$('.wait').show();
                  $('.wait').fadeIn(400).html('<img src="images/loading.gif" />');
                  var user_fb=$('#fb_name').val();
                  var user_tw=$('#tw_name').val();
                  var user_id=$('#usrid').val();
                  $.ajax({
                            type: "POST",
                            url: "functions/soc.php",
                            data: { fb: user_fb, tw: user_tw, uid: user_id },
                            dataType: "json",
                            cache: false,
                            success: function(result){
                            	if(result.stat=='fail'){
			                      		$('.wait').addClass("red");
			                      		$('.wait').fadeIn(400).html(result.query);
                            	}else{
                            		$('.wait').removeClass("red");
			                      		$('.wait').fadeIn(400).html("");
			                      		$('#edit_user').hide();
                            	}
                            }
                           });
                	
                });