fazer

 
  var w = 777;                            
  var img = new Image();                  
        img.onload = function() {         
      w = this.width;                     
 console.log('pre-width: ' + w);          
        if (this.width > 450){            
        e.content = '<a class="ajax-modal modal_image hover_image"  href="' + s + '">' + e.content + '</a>';
        }
    };
    img.src = s;
 console.log('past-width: ' + w);
 

 
    var s = e.content.replace(/\<img src=\"(.+)\" alt.+\>/i,'$1');
 console.log('SRC: '+s);
            var img = new Image();        
            img.src = s;                  
            img.onload = function() {     
 console.log('img-width: '+img.width);    
            if (img.width > 450){         
    e.content = '<a class="ajax-modal modal_image hover_image"  href="' + s + '">' + e.content + '</a>';
                }
            }
        }