function getLeftPositionMais(element, inc) {
       pos = element.style.left.split('p')[0];
       
       if(pos == 'undefined') {
                pos = 0;
       }       
       if(inc == 'undefined') {
                pos = 0;
       }
       
       var newPos = (pos*1) + (inc*1);
       
       return newPos;
}


function getLeftPositionMenos(element, inc) {
       pos = element.style.left.split('p')[0];
       
       if(pos == 'undefined') {
                pos = 0;
       }       
       if(inc == 'undefined') {
                pos = 0;
       }
       
       var newPos = (pos*1) - (inc*1);
       
       return newPos;
}

function setLeftPositionVem(element, posLeft) {
        if(posLeft > -800) {
                element.style.left = posLeft+'px';        
        }
}

function setLeftPositionVai(element, posLeft) {
        if(posLeft < 7) {
                element.style.left = posLeft+'px';        
        }
}

function vai() {        
        var myNumber=0;
	var myInterval = window.setInterval(function () {        
                myNumber++;
                
                var iGaleria = document.getElementById('conteudo_Galeria');        
                if(navigator.appName == 'Microsoft Internet Explorer') {
                        // Para IE
                        var cGaleria = window.frames['conteudo_Galeria'].window.document;
                } else {
                        // Para Outros Navegadores
                        var cGaleria = iGaleria.contentDocument;
                }
                var galeriaTb = cGaleria.getElementById('conteudoMusicas');
                
                galeriaTb.style.position = 'relative';
                
                leftPos = getLeftPositionMais(galeriaTb, 8);
                setLeftPositionVai(galeriaTb, leftPos);
        
		if(myNumber>=80){
                        clearInterval(myInterval);
		}        
        },1);
}

function vem() {
        var myNumber=0;
        var myInterval = window.setInterval(function () {        
                myNumber++;                        
                
                var iGaleria = document.getElementById('conteudo_Galeria');        
                if(navigator.appName == 'Microsoft Internet Explorer') {
                        // Para IE
                        var cGaleria = window.frames['conteudo_Galeria'].window.document;
                } else {
                        // Para Outros Navegadores
                        var cGaleria = iGaleria.contentDocument;
                }
                var galeriaTb = cGaleria.getElementById('conteudoMusicas');
                
                galeriaTb.style.position = 'relative';
                
                leftPos = getLeftPositionMenos(galeriaTb, 8);
                setLeftPositionVem(galeriaTb, leftPos);
                
                
		if(myNumber>=80){
                        clearInterval(myInterval);
		}        
        },1);        
}