WEBページ制作でもたまに使われるイメージマップですが、リンクを追加する位置を固定しなければならないためレスポンシブサイトと相性が悪いです。

そのためレスポンシブサイトでイメージマップを使う場合はプラグインを使う必要があります。
自前で用意してもいいんんですが、せっかく作ってくれた人がいるので利用しない手はないです。

jQuery RWD Image Maps

ダウンロード

プラグインのGitHubにアップされているので以下のURLからダウンロードしてください。
https://github.com/stowball/jQuery-rwdImageMaps

デモ

以下のURLにデモがあります。
ブラウザの横幅を変えることでイメージマップで設定したリンク位置の数字が変化していることがわかります。
http://mattstow.com/experiment/responsive-image-maps/rwd-image-maps.html

使用方法

使い方はすごく簡単です。

プラグインの読み込み

ダウンロード先からダウンロードしてきたファイルをHTMLに読み込ませて、表示させたい画像とクリッカブルの位置を記述したmapタグを書いてください。
あとはjQuery RWD Image Mapsを実行するだけです。
※もちろんjQueryは必要なので別途ダウンロードして読み込ませてください。

<script src="jquery.rwdImageMaps.min.js"></script>
<img src="powerpuff-girls.fw.jpg" width="1024" height="768" usemap="#powerpuffgirls" alt="">
<map name="powerpuffgirls">
		<area shape="poly" coords="122,36,281,36,285,37,287,39,289,42,289,47,289,48,278,77,276,81,274,84,271,85,218,85,218,90,210,90,208,95,207,99,204,100,72,100,26,87,23,84,20,81,19,76,35,40,37,38,43,35,62,35,65,30,68,26,72,25,115,25,119,27,121,30,122,36,122,36" href="#ppg" title="The Powerpuff Girls" alt="The Powerpuff Girls" />
		<area shape="poly" coords="864,668,912,650,922,668,971,667,973,718,981,722,985,729,988,731,1010,731,1010,742,833,742,833,730,865,730,865,721,874,721,874,718,864,668,864,668" href="#cn" title="Cartoon Network" alt="Cartoon Network" />
		<area shape="poly" coords="1010,298,995,281,979,267,962,256,944,248,927,242,909,238,876,236,857,237,838,240,817,246,797,255,778,266,761,281,746,299,735,322,730,335,728,346,726,348,721,349,709,344,711,361,718,378,708,380,697,388,688,398,685,404,685,411,686,419,691,425,698,429,707,431,735,426,743,427,752,433,762,444,774,454,798,469,787,483,779,481,772,482,761,486,753,495,747,505,746,516,746,521,748,527,751,532,759,538,741,561,734,572,732,584,733,591,737,599,744,604,754,607,765,604,776,597,797,570,817,543,857,488,865,488,893,488,910,485,924,483,930,483,935,485,939,490,934,496,931,501,929,506,932,514,938,519,945,522,954,523,966,521,979,516,985,512,989,507,993,500,994,493,991,484,986,476,967,464,982,454,998,440,1013,425,1024,409,1024,329,1017,312,1010,298,1010,298" href="#buttercup" title="Buttercup" alt="Buttercup" />
		<area shape="poly" coords="571,101,563,83,562,66,549,80,541,96,537,112,536,128,537,141,531,141,508,141,508,141,511,133,517,126,533,114,500,111,476,111,452,114,438,118,424,124,410,131,400,140,392,152,390,167,391,174,394,183,400,191,409,198,391,215,379,234,371,252,368,271,367,277,368,298,371,316,381,338,396,358,414,375,399,378,387,385,379,393,377,405,378,412,382,418,388,424,395,429,411,434,425,435,431,446,439,456,459,474,480,488,502,500,514,507,523,515,528,523,530,534,529,541,526,547,515,562,532,556,548,547,562,536,574,523,583,508,590,490,594,470,596,448,596,430,591,410,587,398,599,390,613,382,628,371,643,356,657,337,666,313,669,299,670,284,669,276,668,264,670,263,697,263,704,261,711,257,716,251,719,243,718,236,715,231,706,221,694,215,683,213,677,213,670,215,664,220,656,232,645,215,652,206,657,199,660,191,662,181,660,169,655,158,648,150,638,142,617,130,596,120,582,112,571,101,571,101" href="#blossom" title="Blossom" alt="Blossom" />
		<area shape="poly" coords="254,286,232,271,207,260,179,254,150,252,119,254,103,257,88,263,71,270,61,275,58,274,57,273,45,269,36,268,17,271,7,276,1,283,0,283,0,285,0,290,0,352,2,354,1,355,1,390,3,401,5,410,9,420,22,441,39,460,58,476,47,480,38,487,32,494,30,504,33,515,41,524,53,531,69,534,77,533,85,530,90,525,93,518,91,512,88,508,85,505,85,502,86,499,89,497,97,496,120,500,138,503,154,503,167,503,185,531,215,576,235,609,241,617,248,622,255,626,265,628,273,626,280,621,285,614,287,605,283,592,276,580,261,558,269,553,273,547,276,541,277,536,274,524,267,513,257,504,250,501,244,501,240,502,237,503,225,488,242,478,259,468,276,451,282,447,292,446,318,450,327,448,334,445,339,439,341,431,337,419,329,409,318,401,307,398,301,398,301,393,301,391,303,391,321,393,336,391,352,387,370,380,387,370,373,368,364,364,358,360,353,354,350,347,347,330,345,313,343,302,340,293,336,286,331,280,318,272,305,267,293,266,282,267,272,270,262,276,254,286,254,286" href="#bubbles" title="Bubbles" alt="Bubbles" />
</map>
<script>
$(document).ready(function(e) {
	$('img[usemap]').rwdImageMaps();
});
</script>