Accessing a web service from the client code (Java Script) [closed]

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How and which tasks need to be done for accessing a web service from the client code (Java Script)? Please help.

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if it is ASP.net then following are the steps (http://msdn.microsoft.com/en-us/magazine/cc163354.aspx)

1. Writing a script method to display and invoke the methods of the service

2. Assign result to HTML elements

Here is the code,

<script src="WebService.asmx/jsdebug" type="text/javascript"></script>

function OnMethodSucceeded(result, eventArgs)
{
    var label = Sys.UI.DomElement.getElementById('Label1');
    var sb = new Sys.StringBuilder(); 
    sb.append('You got back a value of '); 
    sb.append(result.toString()); 
    label.innerHTML = sb.toString();  
}

function OnMethodFailed(error)
{
    alert(error.get_message()); 
}