chgImg1 = function(){
document.getElementById("f1").innerHTML='
';
}
chgImg2 = function(){
document.getElementById("f2").innerHTML='
';
}
chgImg3 = function(){
document.getElementById("f3").innerHTML='
';
}
chgImg4 = function(){
document.getElementById("f4").innerHTML='
';
}
chgImg1Restore = function(){
document.getElementById("f1").innerHTML='';
}
chgImg2Restore = function(){
document.getElementById("f2").innerHTML='';
}
chgImg3Restore = function(){
document.getElementById("f3").innerHTML='';
}
chgImg4Restore = function(){
document.getElementById("f4").innerHTML='';
}