var n_slide=0;
var slide_width=0;


function slideFW(kind){

if(kind=='slides'){
  slide_width=750;
}else{
  slide_width=400;
}

if(n_slide<(Math.ceil(tot_width/slide_width)+2) && tot_width>slide_width){
n_slide+=1;
slide(n_slide);
}





}






function slideRW(kind){
if(kind=='slides'){
  slide_width=750;
}else{
  slide_width=400;
}
if(n_slide!=0){
n_slide-=1;
slide(n_slide);
}
}





function slide(n){
d_to=300*n;
d_from=Math.abs(parseInt(document.getElementById("div_slide").style.left));
if(!d_from){d_from=0;}

div_alpha=document.getElementById("div_slide").style;

div_alpha.opacity=.5;
div_alpha.filter='alpha(opacity=50)';

scorri();
}










function scorri(){


diff=Math.abs(d_from-d_to);
scarto=parseInt(diff/2);

if(d_from<=d_to){
d_from=d_from+scarto;
}else{
d_from=d_from-scarto;
}

if(!scarto){
d_to=d_from;
div_alpha.opacity=1;
div_alpha.filter='alpha(opacity=100)';
document.getElementById("div_slide").style.left="-"+d_to+"px";
return;
}

document.getElementById("div_slide").style.left="-"+d_from+"px";

setTimeout("scorri()",100)
} 



function randSlides(n){
slide(n);
n++;

if(750+(300*n)>tot_width){n=0;}
setTimeout("randSlides('"+n+"')",3000)

}