Efecto zoom en las Imágenes

<script src='http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js' type='text/javascript'/>

<script type='text/javascript'>
//<![CDATA[
/* jQuery Image Magnify script v1.1
* This notice must stay intact for usage
* Author: Dynamic Drive at http://www.dynamicdrive.com/
* Visit http://www.dynamicdrive.com/ for full source code

* Nov 16th, 09 (v1.1): Adds ability to dynamically apply/reapply magnify effect to an image, plus magnify to a specific width in pixels.
* Feb 8th, 11 (v1.11): Fixed bug that caused script to not work in newever versions of jQuery (ie: v1.4.4)
*/

jQuery.noConflict()

jQuery.imageMagnify={
 dsettings: {
  magnifyby: 3, //default increase factor of enlarged image
  duration: 500, //default duration of animation, in millisec
  imgopacity: 0.2 //opacify of original image when enlarged image overlays it
  },
 cursorcss: 'url(magnify.cur), -moz-zoom-in', //Value for CSS's 'cursor' attribute, added to original image
 zIndexcounter: 100,

 refreshoffsets:function($window, $target, warpshell){
  var $offsets=$target.offset()
  var winattrs={x:$window.scrollLeft(), y:$window.scrollTop(), w:$window.width(), h:$window.height()}
  warpshell.attrs.x=$offsets.left //update x position of original image relative to page
  warpshell.attrs.y=$offsets.top
  warpshell.newattrs.x=winattrs.x+winattrs.w/2-warpshell.newattrs.w/2
  warpshell.newattrs.y=winattrs.y+winattrs.h/2-warpshell.newattrs.h/2
  if (warpshell.newattrs.x<winattrs.x+5){ //no space to the left?
   warpshell.newattrs.x=winattrs.x+5
  }
  else if (warpshell.newattrs.x+warpshell.newattrs.w > winattrs.x+winattrs.w){//no space to the right?
   warpshell.newattrs.x=winattrs.x+5
  }
  if (warpshell.newattrs.y<winattrs.y+5){ //no space at the top?
   warpshell.newattrs.y=winattrs.y+5
  }
 },

 magnify:function($, $target, options){
  var setting={} //create blank object to store combined settings
  var setting=jQuery.extend(setting, this.dsettings, options)
  var attrs=(options.thumbdimensions)? {w:options.thumbdimensions[0], h:options.thumbdimensions[1]} : {w:$target.outerWidth(), h:$target.outerHeight()}
  var newattrs={}
  newattrs.w=(setting.magnifyto)? setting.magnifyto : Math.round(attrs.w*setting.magnifyby)
  newattrs.h=(setting.magnifyto)? Math.round(attrs.h*newattrs.w/attrs.w) : Math.round(attrs.h*setting.magnifyby)
  $target.css('cursor', jQuery.imageMagnify.cursorcss)
  if ($target.data('imgshell')){
   $target.data('imgshell').$clone.remove()
   $target.css({opacity:1}).unbind('click.magnify')
  }
  var $clone=$target.clone().css({position:'absolute', left:0, top:0, visibility:'hidden', border:'1px solid gray', cursor:'pointer'}).appendTo(document.body)
  $clone.data('$relatedtarget', $target) //save $target image this enlarged image is associated with
  $target.data('imgshell', {$clone:$clone, attrs:attrs, newattrs:newattrs})
  $target.bind('click.magnify', function(e){ //action when original image is clicked on
   var $this=$(this).css({opacity:setting.imgopacity})
   var imageinfo=$this.data('imgshell')
   jQuery.imageMagnify.refreshoffsets($(window), $this, imageinfo) //refresh offset positions of original and warped images
   var $clone=imageinfo.$clone
   $clone.stop().css({zIndex:++jQuery.imageMagnify.zIndexcounter, left:imageinfo.attrs.x, top:imageinfo.attrs.y, width:imageinfo.attrs.w, height:imageinfo.attrs.h, opacity:0, visibility:'visible', display:'block'})
   .animate({opacity:1, left:imageinfo.newattrs.x, top:imageinfo.newattrs.y, width:imageinfo.newattrs.w, height:imageinfo.newattrs.h}, setting.duration,
   function(){ //callback function after warping is complete
    //none added 
   }) //end animate
  }) //end click
  $clone.click(function(e){ //action when magnified image is clicked on
   var $this=$(this)
   var imageinfo=$this.data('$relatedtarget').data('imgshell')
   jQuery.imageMagnify.refreshoffsets($(window), $this.data('$relatedtarget'), imageinfo) //refresh offset positions of original and warped images
   $this.stop().animate({opacity:0, left:imageinfo.attrs.x, top:imageinfo.attrs.y, width:imageinfo.attrs.w, height:imageinfo.attrs.h},  setting.duration,
   function(){
    $this.hide()
    $this.data('$relatedtarget').css({opacity:1}) //reveal original image
   }) //end animate
  }) //end click
 }
};

jQuery.fn.imageMagnify=function(options){
 var $=jQuery
 return this.each(function(){ //return jQuery obj
  var $imgref=$(this)
  if (this.tagName!="IMG")
   return true //skip to next matched element
  if (parseInt($imgref.css('width'))>0 && parseInt($imgref.css('height'))>0 || options.thumbdimensions){ //if image has explicit width/height attrs defined
   jQuery.imageMagnify.magnify($, $imgref, options)
  }
  else if (this.complete){ //account for IE not firing image.onload
   jQuery.imageMagnify.magnify($, $imgref, options)
  }
  else{
   $(this).bind('load', function(){
    jQuery.imageMagnify.magnify($, $imgref, options)
   })
  }
 })
};

jQuery.fn.applyMagnifier=function(options){ //dynamic version of imageMagnify() to apply magnify effect to an image dynamically
 var $=jQuery
 return this.each(function(){ //return jQuery obj
  var $imgref=$(this)
  if (this.tagName!="IMG")
   return true //skip to next matched element
 
 })

};


//** The following applies the magnify effect to images with class="magnify" and optional "data-magnifyby" and "data-magnifyduration" attrs
//** It also looks for links with attr rel="magnify[targetimageid]" and makes them togglers for that image

jQuery(document).ready(function($){
 var $targets=$('.magnify')
 $targets.each(function(i){
  var $target=$(this)
  var options={}
  if ($target.attr('data-magnifyto'))
   options.magnifyto=parseFloat($target.attr('data-magnifyto'))
  if ($target.attr('data-magnifyby'))
   options.magnifyby=parseFloat($target.attr('data-magnifyby'))
  if ($target.attr('data-magnifyduration'))
   options.duration=parseInt($target.attr('data-magnifyduration'))
  $target.imageMagnify(options)
 })
 var $triggers=$('a[rel^="magnify["]')
 $triggers.each(function(i){
  var $trigger=$(this)
  var targetid=$trigger.attr('rel').match(/\[.+\]/)[0].replace(/[\[\]']/g, '') //parse 'id' from rel='magnify[id]'
  $trigger.data('magnifyimageid', targetid)
  $trigger.click(function(e){
   $('#'+$(this).data('magnifyimageid')).trigger('click.magnify')
   e.preventDefault()
  })
 })
})


/***********************************************
* jQuery Image Magnify- (c) Dynamic Drive DHTML code library (www.dynamicdrive.com)
* This notice MUST stay intact for legal use
* Visit Dynamic Drive at http://www.dynamicdrive.com/ for this script and 100s more
***********************************************/

//]]>
</script>

<img src="http://urldelaimagen.jpg" class="magnify" style="width:225px; height:150px" />