function change_display(id){if(get_style(id, 'display')=='block') set_style(id, 'display', 'none');else set_style(id, 'display', 'block');}function set_display(val, id){if(val) set_style(id, 'display', 'block');else set_style(id, 'display', 'none');}function set_style(id, style, value){if(document.getElementById) document.getElementById(id).style[style]=value;else if(document.all) document.all[id].style[style]=value;else if(document.layers) document.layers[id].style[style]=value;}function get_style(id, style){if(document.getElementById) return document.getElementById(id).style[style];else if(document.all) return document.all[id].style[style];else if(document.layers) return document.layers[id].style[style];}function set_str(str, id){if(document.layers) document.layers[id].innerHTML=str;else if(document.all) document.all[id].innerHTML=str;else if(document.getElementById) document.getElementById(id).innerHTML=str;}function set_str_add(str, id){if(document.layers) document.layers[id].innerHTML+=str;else if(document.all) document.all[id].innerHTML+=str;else if(document.getElementById) document.getElementById(id).innerHTML+=str;}function exist_element(id){if(document.layers) return document.layers[id]?true:false;else if(document.all) return document.all[id]?true:false;else if(document.getElementById) return document.getElementById(id)?true:false;}function set_position(x, y, id){x=parseInt(x);y=parseInt(y);if(document.layers){document.layers[id].style.left=x+'px';document.layers[id].style.top=y+'px';}else if(document.all){document.all[id].style.left=x+'px';document.all[id].style.top=y+'px';}else if(document.getElementById){document.getElementById(id).style.left=x+'px';document.getElementById(id).style.top=y+'px';}}function in_array(arr, el){var i=arr.length;for(c=0; c<i; c++) if(arr[c]==el) return true;return false;}