function BlockKeyPress(){
    if (window.event.keyCode == 13)
        window.event.keyCode = 0;
}
function getCharacterCode(e) {
    var characterCode;  //literal character code will be stored in this variable

    if(e && e.which){ //if which property of event object is supported (NN4)
        e = e;
        characterCode = e.which;  //character code is contained in NN4's which property
    }
    else{
        e = event;
        characterCode = e.keyCode;  //character code is contained in IE's keyCode property
    }
    return characterCode;
}