If you are come around core.js file, you all can see many functions available on that file.Those fuctions are very usefull when we need that in customization, for instance

We have a relative url of the current sharepoint site, I need to convert that relative url to absolute url, there comes a simple method called makeAbsUrl

The core.js file can be found @

<Root Directory>:\Program Files\Common Files\Microsoft Shared\web server extensions\12\TEMPLATE\LAYOUTS\1033

Method syntax:

makeAbsUrl(relativeUrl)

//Code in core.js
function makeAbsUrl(strUrl)
{
if (strUrl.length > 0 && “/”==strUrl.substr(0, 1))
{
strUrl=window.location.protocol+”//”+window.location.host+strUrl;
}
return strUrl;
}

Example 1:

makeAbsUrl(“/Lists/AllItems.aspx”);

The above function retuns a value http://server/Lists/Allitems.aspx

Example 2:

If we have a subsite, then we can use makeAbsUrl as

makeAbsUrl(L_Menu_BaseUrl+“/Lists/AllItems.aspx”);

L_Menu_BaseUrl returns a absolute path of the site.

L_Menu_BaseUrl = /sites/subsite

Now we have return value as http://server/sites/subsite/Lists/AllItems.aspx