function mask(end,middle,start,subject){
var one ='mai';
var two='lto:';
var three='?Subject=';
start,middle,end,subject;
var putogether= one+two+start+middle+end+three+subject;
document.location.href=eval('"'+putogether+'"');
}

var doPopUpX = (screen.width/2)-115;
var doPopUpY = (screen.height/2)-115;
var pos = "left="+doPopUpX+",top="+doPopUpY;

function doPopUp(){
doPopUpWindow = window.open("http://www.pianomundo.com/pop.html","Pianomundo","width=230,height=230,"+pos);
}
function doPopUp2(){
doPopUpWindow = window.open("http://www.pianored.com/pop2.html","Pianored","width=400,height=230,"+pos);
}
function doPopUp3(){
doPopUpWindow = window.open("http://www.pianored.com/cursos-desarrollo-personal.html","Pianored","width=270,height=280,"+pos);
}
function doPopUp4(){
doPopUpWindow = window.open("http://www.pianored.com/blogmail.html","Blog","width=500,height=400,"+pos);
}