javascript simple detail plane

data1.onclick=function(e){
/* inline preview pane */
var el=e.target||e.srcElement;
if (el.tagName!="IMG")return;
var tag=el.src.match(/\w+(?=\.jpg)/)[0]||"";
var d=document.createElement("div");
d.id="d"+tag;
d.onclick=function(){el.scrollIntoViewIfNeeded(); this.parentElement.removeChild(this);}
d.style.font="menu";d.style.height="99%";d.style.minHeight="99%";d.style.border="1px solid black";d.style.padding="5px"; d.style.margin="1000px 0px 1000px 0px";
d.innerHTML='<div id="p'+tag+'nav" style="border-bottom:1px dotted black;padding-bottom:3px;text-decoration:none;">' +tag+': ' +
' <a href="http://imgur.com/'+tag+'" target="_blank">imgur</a>' +
' <a href="https://www.google.com/searchbyimage?image_url='+encodeURIComponent('http://i.imgur.com/'+tag+'.jpg')+'" target="_blank">google</a>' +
' </div>' +
'<br><img src="http://notebook1.lan/i/'+tag+'.jpg" alt="" style="margin-top:2px;max-height:94%;overflow-y:hidden;width: auto;height: auto;margin: auto;"/>';
el.parentNode.insertBefore(d,el.nextSibling);
d.scrollIntoViewIfNeeded(true);
return false;
/* http://127.0.0.4/i/BVSZNRd.jpg */
}

data1.onmousemove=function(e){
   /* preload on image hover */
   var el=e.target||e.srcElement;
   if (el.tagName!="IMG" || el===window.el2 ) return;
   //if (el2 && el==el2) return;
   window.el2=el;
   var tag=el.src.match(/\w+(?=\.jpg)/)[0];
   if (!tag) return;
   var im=document.createElement("img");
   im.onload=function(e){
     // console.log(e.srcElement.src,"loaded")
     document.title=""+tag;
     };
   im.src='http://notebook1.lan/i/'+tag+'.jpg';
   //console.log(im.src);
   document.title="loading: " + tag;
   }