function switchProduct(strDiv,bolVisible,num,selectedDiv){

    for (d=1; d<=num; d++) {
        if (d == selectedDiv) {
            document.getElementById("pro-"+d).style.visibility = "visible";
        } else {
            document.getElementById("pro-"+d).style.visibility = "hidden";
        }
        if (selectedDiv > 1) {
            document.getElementById("itsmf").style.visibility = "hidden";
        } else {
            document.getElementById("itsmf").style.visibility = "visible";
        }
    } 
}