function createColumns(){	

	$(".txt").columnize({balance: false, height: 275, cache: false});
	$(".column:first").addClass("selected"); 
	$(".column:not(.selected)").hide(0);	
	setupTxtNav(); 
}

function setupTxtNav() {

	$("#next").bind("click", function() {
		var selected = $(".column").filter(".selected"); 
		var nextOne = selected.next(':hidden');
		if(nextOne.length){
			selected.removeClass("selected").hide(30);
			nextOne.addClass("selected").show(30);  
		} 		
	});

	$("#back").bind("click", function() {
		var selected = $(".column").filter(".selected"); 
		var prevOne = selected.prev(':hidden');	
		if(prevOne.length){
			selected.removeClass("selected").hide(30);
			prevOne.addClass("selected").show(30);  
		}
	});
		
	if ($(".column").length > 1) {
		$(".txtnav").show("slow"); 
	}
	else {
		$(".txtnav").hide("fast"); 
	}
}

function UpdateDisabledButtons(){	 

	var prevSection = $(".column").filter(".selected").prev(':hidden'); 
	var nextSection = $(".column").filter(".selected").next(':hidden'); 

	if(nextSection.length){
		$("#next").removeAttr("disabled");
	} else {
		$("#next").attr("disabled","disabled");
	}

 	if(prevSection.length) {
		$("#back").removeAttr("disabled");
	} else {
		$("#back").attr("disabled","disabled");
	}

	$('.txtnav input[disabled|=""]').addClass("disabled"); 
	$('.txtnav input').not('[disabled|=""]').removeClass("disabled"); 	
}

$(function() {
	createColumns();
	
});