The using of Javascript for Hover is Old Now. Now you can render faster than javascript and also run on No Javascript Mode.

CSS Code:

#mainwrapper {  
  font: 10pt normal Arial, sans-serif;  
  height: auto;  
  margin: 80px auto 0 auto;
  text-align: center;  
  width: 660px;  
}  

#mainwrapper .box {
    border: 5px solid #fff;
    cursor: pointer;
    height: 172px;
    float: left;
    margin-bottom: 20px;
    position: relative;
    overflow: hidden;
    width: 300px;
    -webkit-box-shadow: 1px 1px 1px 1px #ccc;
    -moz-box-shadow: 1px 1px 1px 1px #ccc;
    box-shadow: 1px 1px 1px 1px #ccc;
}

#mainwrapper .box img {
    position: absolute;
    left: 0;
    -webkit-transition: all 300ms ease-out;
    -moz-transition: all 300ms ease-out;
    -o-transition: all 300ms ease-out;
    -ms-transition: all 300ms ease-out;
    transition: all 300ms ease-out;
	width: auto;
	height: 100%;
}


#mainwrapper .box .caption {
    background-color: rgba(0,0,0,0.8);
    position: absolute;
    color: #fff;
    z-index: 100;
    -webkit-transition: all 300ms ease-out;
    -moz-transition: all 300ms ease-out;
    -o-transition: all 300ms ease-out;
    -ms-transition: all 300ms ease-out;
    transition: all 300ms ease-out;
    left: 0;
}
#mainwrapper .box .fade-caption, #mainwrapper .box .scale-caption {
    opacity: 0;
    width: 280px;
    height: 152px;
    text-align: left;
    padding: 15px;
}

#mainwrapper .box:hover .fade-caption {  
    opacity: 1;  
}

Output : The Above Images Pick from Wallpaperology.com
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