function openMopayPopup(user_id,productid) {
	
	var IE = /*@cc_on!@*/false;
	
	//check browser:
	//if opera:
	if (/Opera[\/\s](\d+\.\d+)/.test(navigator.userAgent)){
		
		window.open("http://www.sqwishland.com/maingame/mopay_window.php?user_id="+user_id+"&productid="+productid+"","mopaywindow","menubar=no,width=550,height=450,toolbar=no");
		
	} else if (IE) {
	
		window.open("http://www.sqwishland.com/maingame/mopay_window.php?user_id="+user_id+"&productid="+productid+"","mopaywindow","menubar=no,width=550,height=450,toolbar=no");
	
	} else {
		
		//open modal window
		var btnSubmitTags = document.getElementById('hiddenButton');
		var params = "http://www.sqwishland.com/maingame/mopay_window.php?user_id="+user_id+"&productid="+productid+"&placeValuesBeforeTB_=savedValues&TB_iframe=true&modal=true&height=450&width=550";

		document.getElementById("hiddenButton").setAttribute("alt",params);	

		btnSubmitTags.click();
	}
	
	

}