how to get specific string

[liicis]

Hi,
I have one issue:
to finish one of my functions I need access to specific string from html file, but I can't figure out how to do that.
For example I have html:
<li class="zumzum3" style="background-image: url(http://duu.lv/test2/images/stories/foto ... unde_1.jpg); background-repeat: no-repeat;" title="Dāvis Spunde"><img src="/test2/images/stories/fotografi/davis_spunde/Davis_Spunde_1.jpg" alt="Dāvis Spunde" border="0"></li>
And at the end I need to get result:
str="http://duu.lv/test2/images/stories/fotografi/davis_spunde/Davis_Spunde_1.jpg";
How can I cut that string that follow "li class= "zumzum3" style="background-image: url", and contains image url?
I realy don't know.
Thanks in advance.

[liicis]

OK, I did it by myself:
window.onload=gethtml;
function gethtml() {
var str = document.body.innerHTML;
str.toString();
var meklejam = str.search("zumzum3");
if(meklejam != -1){
var zz = str.search("zumzum3");
//alert(zz);
var nog = (str.substr(zz+38,200));
//alert(nog);
var nog1 = nog.search(';');
//alert(nog1);
var nog2 =(nog.substring(0,nog1-1));
//alert(nog2);
var str2 = '<img src="'+nog2+'" border="0">';
//alert(str2);
var str1 = 'Vieta_bildei';
var str3 = str.replace(str1,str2);
//alert(str3);
//document.body.innerHTML = str3;

}