function FP_swapImg() {//v1.0
 var doc=document,args=arguments,elm,n; doc.$imgSwaps=new Array(); for(n=2; n<args.length;
 n+=2) { elm=FP_getObjectByID(args[n]); if(elm) { doc.$imgSwaps[doc.$imgSwaps.length]=elm;
 elm.$src=elm.src; elm.src=args[n+1]; } }
}

function FP_preloadImgs() {//v1.0
 var d=document,a=arguments; if(!d.FP_imgs) d.FP_imgs=new Array();
 for(var i=0; i<a.length; i++) { d.FP_imgs[i]=new Image; d.FP_imgs[i].src=a[i]; }
}

function FP_getObjectByID(id,o) {//v1.0
 var c,el,els,f,m,n; if(!o)o=document; if(o.getElementById) el=o.getElementById(id);
 else if(o.layers) c=o.layers; else if(o.all) el=o.all[id]; if(el) return el;
 if(o.id==id || o.name==id) return o; if(o.childNodes) c=o.childNodes; if(c)
 for(n=0; n<c.length; n++) { el=FP_getObjectByID(id,c[n]); if(el) return el; }
 f=o.forms; if(f) for(n=0; n<f.length; n++) { els=f[n].elements;
 for(m=0; m<els.length; m++){ el=FP_getObjectByID(id,els[n]); if(el) return el; } }
 return null;
}

function check_image(filename) {
    if (filename == "") return false;
    var ext = filename.substring(filename.length-3, filename.length);
    ext = ext.toLowerCase();
    if (ext == "jpg" || ext =="bmp" || ext =="png" || ext == "gif")
        return true;
    else
        return false;
}

function check_digit(obj) {
    var str = obj.value;
    var tmp = "";
    var ch;
    var idx;
    for(idx = 0; idx < str.length; idx++) {
        ch = str.substring(idx, idx+1);
        if (!isNaN(ch))
            tmp = tmp + ch;
    }
    obj.value = tmp;
}
function check_double(obj) {
    var str = obj.value;
    var tmp = "";
    var ch;
    var idx;
    chsize = 0;
    for(idx = 0; idx < str.length; idx++) {
        ch = str.substring(idx, idx+1);
        if (!isNaN(ch) || (ch=="." && chsize == 0))
            tmp = tmp + ch;
        if (ch == ".")
            chsize ++;
    }
    obj.value = tmp;
}

function set_alert(msg, div_id) {
    var div;
    if (div_id)
        div = document.getElementById(div_id);
    else
        div = document.getElementById("div_alert");
    if (div) {
        div.innerHTML = msg;
    }
}