//字号放大缩小
function fontresizer(smallfont, medfont, largefont) {
	$(".medfont").addclass("curfont");
	
	function clearselected() {
		$(".smallfont").removeclass("curfont");
		$(".medfont").removeclass("curfont");
		$(".largefont").removeclass("curfont");
	}

	function savestate(cursize) {
		var date = new date();
		date.settime(date.gettime() + (7 * 24 * 60 * 60 * 1000));
		var expires = "; expires=" + date.togmtstring();
		document.cookie = "fontsizer" + "=" + cursize + expires + "; path=/";
	}

	$(".smallfont").click(function() {//缩小
		changefontsize("#zoom,#zoom p[style*='font-size'],#zoom span[style*='font-size'],#zoom font[style*='font-size']","-");
		clearselected();
		$(".smallfont").addclass("curfont");
		//savestate(smallfont);
	});

	$(".medfont").click(function() {//还原
		$("#zoom,#zoom p,#zoom span,#zoom font").each(function(){
			if($(this).attr("old-size")){
				$(this).css("font-size",$(this).attr("old-size"));
			}
		})
		clearselected();
		$(".medfont").addclass("curfont");
		//savestate(medfont);
	});

	$(".largefont").click(function() {//放大
		changefontsize("#zoom,#zoom p[style*='font-size'],#zoom span[style*='font-size'],#zoom font[style*='font-size']","+");
		clearselected();
		$(".largefont").addclass("curfont");
		//savestate(largefont);
	});

	function changefontsize(demo,type){
		$(demo).each(function(){
			var size = $(this).css("font-size");
			if(!$(this).attr("old-size")){
				$(this).attr("old-size",size);
			}
			if(type=="+"){
				size = (parseint(size)+2)+"px";
				if($(this).attr("old-size")){
					if(parseint(size) - parseint($(this).attr("old-size")) > 10){
						size = (parseint(size)-2)+"px";
					}
				}
			}else if(type == "-"){
				size = (parseint(size)-2)+"px";
				if($(this).attr("old-size")){
					if(parseint($(this).attr("old-size")) - parseint(size) > 10){
						size = (parseint(size)+2)+"px";
					}
				}
			}
            $(this).css("font-size",size);
		});
	}
    function getcookie_content(name) {
		var arr, reg = new regexp("(^| )" + name + "=([^;]*)(;|$)");
		if (arr = document.cookie.match(reg)) return unescape(arr[2]);
		else return null;
	}
	function setcookie_content(objname, objvalue) {
		var str = objname + "=" + escape(objvalue);
		str += "; path=/;";
		document.cookie = str;
	}
	var savedsize = getcookie_content('fontsizer');
	//console.log(savedsize);
	if(savedsize != "" && savedsize!=null) {
		$('#zoom').css('font-size', savedsize);
		switch(savedsize) {
			case smallfont:
				$(".smallfont").addclass("curfont");
				break;
			case medfont:
				$(".medfont").addclass("curfont");
				break;
			case largefont:
				$(".largefont").addclass("curfont");
				break;
			default:
				$(".largefont").addclass("curfont");
		}
	} else {
		$('#zoom').css('font-size', medfont);
		$(".medfont").addclass("curfont");
	}

}
$(document).ready(function() {
	fontresizer('14px', '16px', '18px');
});

function changecolor(colorname) {
	document.getelementbyid("c").style.background = colorname;
	$("#zoom *").css("background","none");
}