var current_slide = 1;          

var slides_counter='';
var max_num = 6;
var timeout = 5000;

function start_sliders_interval(tm){
        timeout = tm;
        if(slides_counter==''){
                slides_counter=window.setInterval('rotate_slides()',timeout);
        }
}

function stop_sliders_interval(){
        if(slides_counter!=''){
                window.clearInterval(slides_counter);
                slides_counter='';
        }
}
function call_slides(slide_num){        
        //return;
        var n;
        n=1;
        while (n<=max_num) {
         if (slide_num==n) {
          document.getElementById('slide'+n).style.display = 'block';
          current_slide = slide_num;
         }
         n++;
        }
        n=1;
        while(n<=max_num){
                if(slide_num == n){             
                        //document.getElementById('slide'+n).style.display = 'block';
                        //current_slide = slide_num;
                }
                else {
                        document.getElementById('slide'+n).style.display = 'none';
                }
                n++
        }
}

function call_next(){
        current_slide = current_slide + 1;
        if(current_slide > max_num) current_slide = 1;                  
        call_slides(current_slide);

}

function call_prev(){
        current_slide = current_slide - 1;
        if(current_slide < 1) current_slide = max_num;                  
        call_slides(current_slide);
}


function rotate_slides() {
        current_slide = current_slide + 1;
        if(current_slide > max_num) current_slide = 1;
        //alert(current_slide);                  
        call_slides(current_slide);
}