asp localise text

[nitrogen]

I am working on asp website with the following code:\[code\]<div class="btn-continuer"><a href="http://stackoverflow.com/questions/13758980/<%=urlGoBack%>"><span><%=btn_continuer_achats%></span> </a></div>\[/code\]I am having problem understanding the <%=variablename%> format.what does this mean? how does this text which appear in the variable correctly displays in different languages.I have to put another button, but as i am putting into static HTML , the localisation is not being performed.thanks for your help