Call button click Event in href tag

[mansi sharma]

CODE BEHIND PAGE CODE

protected void Button1_Click(object sender, EventArgs e)
    {
        SHow("MANSI"); 
    }

    public void SHow(string error)
    {
        Page page1 = HttpContext.Current.Handler as Page;
        if (page1 != null)
        {
            error = error.Replace("'", "\'");
            ScriptManager.RegisterStartupScript(page1, page1.GetType(), "err_msg", "alert('" + error + "');", true);     
        }
    }

SOURCE CODE

<ul>
		<li><a href="#" onClick='Button1_Click'>Home</a></li>
		<li><a href="#">News</a></li>
		<li><a href="#">Blog</a></li>
		<li><a href="#">Gallery</a></li>
		<li><a href="#">About CWS</a></li>
		<li><a href="#">Contact</a></li>
	</ul>

When I click on Home,I am getting Javascript error Button1_Click is undefined,but it is defined in the code behind,you can see above.