jquery 1.4 , synchronous request

jquery 1.4 , synchronous request

var path_data = path+"?q=map/get_data/"+param1+'/'
+param2+'/'+param3+'/' +param4+'/' +param5;
var path_map_center = path+"?q=map/get_center/"+param1;
$.getJSON(path_map_center, function(data) {
center_lati = data.lati;
center_longi = data.longi;
});
// How to ensure , center_lati center_longi are assigned before i move to
next line of code. // Basically how to wait till above execute.