get_element = document.all ? function (s_id) { return document.all[s_id] } : function (s_id) { return document.getElementById(s_id) };


function is_email(str)
{
    var p1=str.indexOf('@');
    var p2=str.indexOf('.',p1);
    if((p1>0)&&(p2>(p1+1))&&(str.length>(p2+2))) return true;
    return false;
} 

function set_visible(block,sh)
{
    if(!block) return;
    var disp='none';
    if(sh) disp='block';
    if(sh=='block') disp='block';
    if(sh=='none') disp='none';
    //
    if(block.style)
    {
	block.style.display=disp;
    }
    else
    {
	block.display=disp;
    }
}


function is_visible(block)
{
    if(!block) return;
    if(block.style)
    {
	if(block.style.display=='none') return 0;
	return 1;
    }
    else
    {
	if(block.display=='none') return 0;
	return 1;
    }
}


function toggle_div(div_id,noneblock)
{
    var div_o=get_element(div_id); 
    var st=is_visible(div_o);
    
    if(noneblock=='none') st=1;
    if(noneblock=='block') st=0;
    
    if(st==0)
    {
	set_visible(div_o,1);
    } 
    else
    {
	set_visible(div_o,'none');
    }
}


function toggle_panel_menu(div_id,div_arr,color1,color2)
{
    var n=div_arr.length;
    var id='';
    var div_oo=null;
    var div_ll=null;
    var div_ox=get_element(div_id);
    var div_lx=get_element(div_id+'_link');
    //
    for(i=0;i<n;i++)
    {
	id=div_arr[i];
	div_oo=get_element(id);
	div_ll=get_element(id+'_link');
	//
	div_ll.style.backgroundColor=color1;
	div_ll.style.fontWeight='normal';
	div_oo.style.display='none';
    }
    //
    div_ox.style.display='block';
    div_lx.style.backgroundColor=color2;
    div_lx.style.fontWeight='bold';
}


function validate_form(form,fields)
{
    var valid = true;
    var validx = true;
    var n=fields.length;
    var element=null;
    var typ=null;
    var divx=null;
    for(i=0;i<n;i++)
    {
	validx = true;
	element=form.elements[fields[i][0]];
	typ=fields[i][1];
	divx=get_element(fields[i][2]);
	if(typ=='text') if(element.value.length < 1) validx=false;
	if(typ=='email') if(!is_email(element.value)) validx=false;
	if(typ=='select') if(element.selectedIndex < 1) validx=false;
	if(!validx)
	{
	    set_visible(divx,1);
	}
	else
	{
	    set_visible(divx,0);
	}
	if(valid) element.focus();
	//window.alert(fields[i][0]+' '+fields[i][1]+' '+fields[i][2]+' = '+validx+'\n');
	//window.alert(fields[i][2]+' = '+divx);
	if(!validx) valid=false;
    }
    return valid;
}