var form = $('form'), formVal = form.val();
form.val('').focus().val(formVal);

.isnta { display: inline-block; width: 16px; height: 16px; background: url('/images/isnta.png') 0 0 no-repeat; }
.isnta:hover { background: url('/images/isnta_hover.png') 0 0 no-repeat; }

<a href="#" class="ico ico_isnta">Instagram</a>
<a href="#" class="ico ico_youtubecom">Youtube</a>

.ico { display: inline-block; width: 16px; height: 16px; overflow: hidden; text-indent: -300em; }
.ico_isnta { background: url('/images/isnta.png') 0 0 no-repeat; }
.ico_isnta:hover { background: url('/images/isnta_hover.png') 0 0 no-repeat; }
.ico_youtubecom { background: url('/images/youtubecom.png') 0 0 no-repeat; }
.ico_youtubecom:hover { background: url('/images/youtubecom_hover.png') 0 0 no-repeat; }