How to call webservice in HTML page

Question

Dear All,
Can anybody tell me how to call webservice in HTML page.

I have onemethod in my webservice like
public bool Check(string S,string R)
{
 if(S==R)
 return true;
 else
 return false;
}

I want to call this method in my HTML page.
I have little bit idea that we can achieve this by using Javascript or else by JQuery. If it possible in these two ways can anybody explain this with example.

Thank you ,