jquery - javascript check json for img tag and change src -

hi have custom made crm saves img's in our database /upload/image/image.jpg have images have full url. need way find out if image starts /upload , add our web address front of image src image shows correctly , not square no image,

we using json , javascript here code have far

function loadnewsstory(e) {      if(newsview !== true)     {         document.getelementbyid("newsarticals").style.display = "block";         document.getelementbyid("activecontent").style.display = "none";         newsview = true;     }       xmlhttp=new xmlhttprequest();     xmlhttp.open("post","http://media.queerdio.com/mobiledevice/?uri=loadstory/"+e ,false);     xmlhttp.send();      var newsreponse = json.parse(xmlhttp.responsetext);     var news = newsreponse[0];      document.getelementbyid("newsarticals").innerhtml = '<h1 class="newsheader">' + news.post_title + '</h1> <div class="newsbody">'+news.post_content+'</div>';     window.scrollto(0,0);  } 

the part need @ news.post_content great.

edit: added json looks like

"post_content":"<p>dr sharon giese household name in america, starring on hit medical shows dr oz , doctors , making regular appearances on cbs news, cnn , nbc.<\/p>\n<p>dr giese ranked among best in field but, 1 family discovered \"with tragic consequences\" best make mistakes.<\/p>\n<center><img src=\"..\/..\/..\/upload\/health\/dr sharon giese - dr oz - youtube.jpg\" alt=\"dr oz show - dr sharon\" width=\"650\" height=\"488\" \/><\/center>\n<div style=\"padding: 0; margin: -6px 0 4px 10px; text-align: left;\">a screen grab recent appearance on dr oz show. picture: youtube source: youtube<\/div>\n<p>in june 2009, 32-year-old mother-of-two adriana porras underwent liposuction, fat reduction procedure performed dr giese. ms porras died 2 days later of pulmonary embolism.<\/p>\n<p>her husband pablos balzola sued dr giese negligence, claiming did not return frantic calls when ms porras showed signs of severe post-surgery complications, complaining of chest pains , shortness of breath.<\/p>\n<p>in court, pathologists testified had received treatment symptoms, chance of survival have been higher.<\/p>\n<p>it later found out dr giese had not performed procedure in hospital in own home office.<\/p>\n<p>this week reached settlement mr balzola, agreeing pay us$2.3 million (aud$2.5 million)<\/p>\n<p>the money reportedly split between widower, six-year-old daughter maia , nine-year-old son nicholas. mr balzola" 

i have used code our feature_images

 if(news.featured_image.substring(0, 7) !== "http://")         {         news.featured_image = "http://www.radiobreakout.com.au/"+news.featured_image;         } 

but how @ img srcs in post_content.

please consider this:

var articles = document.getelementbyid('newsarticals'); var activecontent = document.getelementbyid('activecontent'); var httpurl = /^http:/; function loadnewsstory(e) {     if (newsview !== true) {         articles.style.display = 'block';         activecontent.style.display = 'none';         newsview = true;     }      var xmlhttp = new xmlhttprequest();     xmlhttp.open('post','http://media.queerdio.com/mobiledevice/?uri=loadstory/' + e , false);     xmlhttp.send();      // empty articles element first     while (articles.children.length) articles.removechild(articles.firstchild);     // create document fragment out of response     var newsarray = json.parse(xmlhttp.responsetext);     var newsel = newsarray.reduce(function htmlcreator(frag, news) {         // create elements first         var header = document.createelement('h1');         var div = document.createelement('div');         header.classname = 'newsheader';         header.appendchild(document.createtextnode(news.post_title));         // innerhtml shouldn't used, we'll let slide time         // next time don't store html in json         div.innerhtml = news.post_content;         div.classname = 'newsbody';         // loop through of newly added images change sources         array.prototype.foreach.call(div.queryselectorall('img'), function sourcemangler(el) {             if (!httpurl.test(el.src)) el.src = 'http://www.radiobreakout.com.au/' + el.src.split('/').filter(function removesome(part) { return (part && part !== '..'); }).join('/');         });         frag.appendchild(header);         frag.appendchild(div);         return frag;     }, document.createdocumentfragment());     // append fragment empty element     articles.appendchild(newsel);     window.scrollto(0,0); }