if (navigator.userAgent.search("MSIE") >= 0) {
    //code goes here
}
else if (navigator.userAgent.search("Chrome") >= 0) {
    //code goes here
}
else if (navigator.userAgent.search("Firefox") >= 0) {
    //code goes here
}
else if (navigator.userAgent.search("Safari") >= 0 && navigator.userAgent.search("Chrome") < 0) {
    //code goes here
}
else if (navigator.userAgent.search("Opera") >= 0) {
    //code goes here
}