$(document).ready(function() {
	current_menu = '';
	channels = new Array("discover", "connect", "buy");

	$("#btn_discover").click(function() {
		masthead_dropdown('discover', current_channel);
	});
	
	$("#btn_connect").click(function() {
		masthead_dropdown('connect', current_channel);
	});
	
	$("#btn_buy").click(function() {
		masthead_dropdown('buy', current_channel);
	});
});

function masthead_dropdown(menu, channel) {	
	if (current_menu != menu) {
		for (i = 0; i < channels.length; i++) {
			if (channels[i] == menu) {
				if (menu == channel) {
					$("#btn_"+channels[i]+" IMG").attr("src", "/images/common/tab/"+channels[i]+"_on_col.png");
				} else {
					$("#btn_"+channels[i]+" IMG").attr("src", "/images/common/tab/"+channels[i]+"_off_col.png");
				}	
			} else {
				if (channels[i] == channel) {
					$("#btn_"+channels[i]+" IMG").attr("src", "/images/common/tab/"+channels[i]+"_on_exp.png");
				} else {
					$("#btn_"+channels[i]+" IMG").attr("src", "/images/common/tab/"+channels[i]+"_off_exp.png");
				}
			}
		}
		$("div[id^=dropdown_]").hide();
		$("#masthead_dropdown").slideDown("normal");
		$("#dropdown_"+menu).show();
		
		current_menu = menu;
	} else {
		if (menu == channel) {
			$("#btn_"+menu+" IMG").attr("src", "/images/common/tab/"+menu+"_on_exp.png");
		} else {
			$("#btn_"+menu+" IMG").attr("src", "/images/common/tab/"+menu+"_off_exp.png");
		}
		$("div[id^=dropdown_]").hide();
		$("#masthead_dropdown").slideUp("normal");
		
		current_menu = '';
	}
}