function mudaCor()
{
    var total = 3;
	var num = Math.floor(Math.random()*total) + 1;
    
    if(document.getElementById('site').className=='cor'+num){
    	
    	if(num>=total)
    		num=1;
    	else
    		num=num+1;
    		
    }
    if(num == 2){
		var Cor = "#FF0000";
		}
	if(num == 1){var Cor = "#000000";}
	if(num == 3){var Cor = "#337f05";}
	if(num == 4){}
    document.getElementById('fundo').className='img'+num;
	document.getElementById('topo').className='topo'+num;
	document.getElementById('baixo').className='baixo'+num;
	document.body.className='cor'+num;
	document.getElementById('borda2').style.borderColor = Cor;
	document.getElementById('borda1').style.borderColor = Cor;
    //alert('cor'+num);
}