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function openWindow (nsOie) {
if (nsOie == 0) {
 window.open ('http://www.microsoft.com/windows/ie_intl/es/','','width=600,height=400,scrollbars=yes') ;
 }
 if (nsOie == 1) {
 window.open ('http://home.netscape.com/es/download/index.html?cp=djues','','width=600,height=400,scrollbars=yes') ;
 }
 }
 
 function Browser() {
 var b=navigator.appName;
 if (b=="Netscape") this.b="ns";
 else if (navigator.userAgent.indexOf("Opera")>0) this.b = "opera";
 else if (b=="Microsoft Internet Explorer") this.b="ie";
 this.version=navigator.appVersion ;
 this.v=parseInt(this.version) ;
 this.nsmenor=(this.b=="ns" && this.v<4) ;
 this.ns=(this.b=="ns" && this.v>=4) ;
 this.ns4=(this.b=="ns" && this.v==4) ;
 this.ns5=(this.b=="ns" && this.v==5) ;
 this.iemenor=(this.b=="ie" && this.v<4) ;
 this.ie=(this.b=="ie" && this.v>=4) ;
 this.ie4=(this.version.indexOf('MSIE 4')>0) ;
 this.ie5=(this.version.indexOf('MSIE 5')>0) ;
 this.ie55=(this.version.indexOf('MSIE 5.5')>0) ;
 this.opera=(this.b=="opera") ;
 
 if (this.iemenor == true || this.nsmenor == true) {
 var aceptado = confirm ("Tu versión de navegador és muy antigua. Si desea actualizarla pulse Aceptar")
 if (aceptado == true && this.iemenor == true) {
 openWindow (0) ;
 }
 if (aceptado == true && this.nsmenor == true) {
 openWindow (1) ;
 }
 }
 }
 
 is = new Browser();
 
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