function coloracelle() { 
               
            for(var g = 1; g < 8; g++) {
            var tabella = document.getElementById("tabellas"+g);
                                                 
 var td = tabella.getElementsByTagName('td');
    var count_td = td.length;
for(var i = 0; i < count_td; i++) {
if(i%2==0) {
td[i].style.backgroundColor = "TOMATO";
}else{
td[i].style.backgroundColor = "DODGERBLUE"; }
}
} }
             function coloratasto() {
             for(var d = 1; d <106; d++) {
               var tastost = document.getElementById("forum"+d); 
                        if(d%2==0) {    
                               tastost.style.backgroundColor  = "DODGERBLUE"; 
                         }else{
                               tastost.style.backgroundColor  = "TOMATO"; }
                               
                                       } }