onBeforeSelect

fires a moment before a row in the grid is selected

void onBeforeSelect(string|number new_row,string|number old_row,number new_col_index);

new_row	string\|number	the id of a newly selected row
old_row	string\|number	the id of a previously selected row
new_col_index	number	the index of a newly selected cell/column

Available only in PRO Edition

grid.attachEvent("onBeforeSelect", function(new_row,old_row,new_col_index){
    //your code here
});