JavaScript Javascript Popup with Blocking detection
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function popup(url,ancho,alto,id,extras){
if(navigator.userAgent.indexOf("Mac")>0){ancho=parseInt(ancho)+15;alto=parseInt(alto)+15;}
var left = (screen.availWidth-ancho)/2;
var top = (screen.availHeight-alto)/2;
if(extras!=""){extras=","+extras;};
var ventana = window.open(url,id,'width='+ancho+',height='+alto+',left='+left+',top='+top+',screenX='+left+',screenY='+top+extras);
var bloqueado = "AVISO:\n\nPara ver este contenido es necesario que desactive\nel Bloqueo de Ventanas para este Sitio."
//var bloqueado = "WARNING:\n\nIn order to use this functionality, you need\nto deactivate Popup Blocking."
if(ventana==null || typeof(ventana.document)=="undefined"){ alert(bloqueado) }else{ return ventana; };
}
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