function No13(e) {
var key;
if(window.event)
  key = window.event.keyCode; //IE
else
  key = e.which; //firefox
  if(key == 13)
    return false;
  else
    return true;
}

var xSCREENWIDTH, xSCREENHEIGHT

function browserWindowSize() {
var browserWinWidth = 0, browserWinHeight = 0;
if( typeof( window.innerWidth ) == 'number' ) {
//Non-IE
browserWinWidth = window.innerWidth;
browserWinHeight = window.innerHeight;
} else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
//IE 6+ in 'standards compliant mode'
browserWinWidth = document.documentElement.clientWidth;
browserWinHeight = document.documentElement.clientHeight;
} else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
//IE 4 compatible
browserWinWidth = document.body.clientWidth;
browserWinHeight = document.body.clientHeight;
}
xSCREENWIDTH = browserWinWidth;
xSCREENHEIGHT = browserWinHeight;
}