Folks, I have a PHP application that stores fairly large datasets. Each data set is composed of data points for 96 markers in 96 individuals. Right now, the user can either download the whole dataset or supply a list of markers in a txt file. However, the users want me to make a pop up form (I was thinking radio buttons) in which they can select the markers they want from the dataset. So I was thinking of a scheme where I would use java script to open another window, where the form with the radio buttons would be populated based on the database. The user would select the markers he wants and I would store that in session array. Then I can use the selection in the script that actually processes the data. Does that sound feasible and relatively efficient? T. -- "Education is not to be used to promote obscurantism." - Theodonius Dobzhansky. "Gracias a la vida que me ha dado tanto Me ha dado el sonido y el abecedario Con él, las palabras que pienso y declaro Madre, amigo, hermano Y luz alumbrando la ruta del alma del que estoy amando Gracias a la vida que me ha dado tanto Me ha dado la marcha de mis pies cansados Con ellos anduve ciudades y charcos Playas y desiertos, montañas y llanos Y la casa tuya, tu calle y tu patio" Violeta Parra - Gracias a la Vida Tiago S. F. Hori. PhD. Ocean Science Center-Memorial University of Newfoundland