@function pad($radius) {
    $radius: boxmax($radius);
    $radius: parseint($radius);
    @if $radius >= 10 {
        @return $radius;
    }
    @else {
        @return "0" + $radius;
    }
}

@mixin x-frame(
    $cls, 
    $ui: null, 
    $border-radius: 0px, 
    $border-width: 0px, 
    $padding: null, 
    $background-color: null, 
    $background-gradient: null,
    $table: false,
    $background-direction: top
) {
    $cls-ui: $cls;
    @if $ui != null {
        $cls-ui: $cls + '-' + $ui;
    }
    
    $vertical: false;
    @if $background-direction == left or $background-direction == right {
        $vertical: true;
    }

    $frame-top: max(top($border-radius), right($border-radius));
    $frame-right: max(right($border-radius), bottom($border-radius));
    $frame-bottom: max(bottom($border-radius), left($border-radius));
    $frame-left: max(left($border-radius), top($border-radius));
    
    $padding-top: 0;
    $padding-right: 0;
    $padding-bottom: 0;
    $padding-left: 0;
    
    @if $padding == null {
        $padding-top: $frame-top - top($border-width);
        $padding-right: $frame-right - right($border-width);
        $padding-bottom: $frame-bottom - bottom($border-width);
        $padding-left: $frame-left - left($border-width);
    }
    @else {
        $padding-top: top($padding);
        $padding-right: right($padding);
        $padding-bottom: bottom($padding);
        $padding-left: left($padding);    
    }
    
    @if $padding-top < $frame-top {
        $padding-top: $frame-top - top($border-width);
    }
    @if $padding-right < $frame-right {
        $padding-right: $frame-right - right($border-width);
    }
    @if $padding-bottom < $frame-bottom {
        $padding-bottom: $frame-bottom - bottom($border-width);
    }
    @if $padding-left < $frame-left {
        $padding-left: $frame-left - left($border-width);
    }
     
    .#{$prefix}#{$cls-ui} {
        @if $supports-border-radius {
            @if length($border-radius) == 2 {
                @include border-top-left-radius(nth($border-radius, 1));
                @include border-top-right-radius(nth($border-radius, 2));
            } @else if length($border-radius) == 3 {
                @include border-top-left-radius(nth($border-radius, 1));
                @include border-top-right-radius(nth($border-radius, 2));
                @include border-bottom-right-radius(nth($border-radius, 3));
            } @else if length($border-radius) == 4 {
                @include border-top-left-radius(nth($border-radius, 1));
                @include border-top-right-radius(nth($border-radius, 2));
                @include border-bottom-right-radius(nth($border-radius, 3));
                @include border-bottom-left-radius(nth($border-radius, 4));
            } @else {
                @include border-radius($border-radius);
            }
        }
        padding: $padding-top $padding-right $padding-bottom $padding-left;
        border-width: $border-width;
        border-style: solid;
        @if $background-color != null {
            @if $supports-gradients and $background-gradient != null {
                @include background-gradient($background-color, $background-gradient, $background-direction);
            }
            @else {
                background-color: $background-color;
            }      
        }
    }
    
    @if not $supports-gradients or $compile-all {
        .#{$prefix}nlg {
            .#{$prefix}#{$cls-ui}-mc {
                @if $background-gradient != null {
                    background-image: theme-background-image($theme-name, '#{$cls}/#{$cls-ui}-bg.gif', false, $relative-image-path-for-uis);
                }
                @if $background-color != null {
                    background-color: $background-color;
                }
            }
        }        
    }
    
    @if not $supports-border-radius or $compile-all {
        .#{$prefix}nbr {
            .#{$prefix}#{$cls-ui} {
                padding: 0 !important;
                border-width: 0 !important;
                @include border-radius(0px);
                @if $background-color != null {
                    background-color: transparent;
                }
                @else {
                    background: #fff;
                }

                $type: '100';
                @if $table == true {
                    $type: '110';
                }
                $direction: '100';
                @if $vertical == true {
                    $direction: '110';
                }
                
                $left: $type + pad(top($border-radius)) + pad(right($border-radius)) + 'px';
                $top: $direction + pad(bottom($border-radius)) + pad(left($border-radius)) + 'px';
                background-position: unquote($left) unquote($top);
            }

            .#{$prefix}#{$cls-ui}-tl,
            .#{$prefix}#{$cls-ui}-bl,
            .#{$prefix}#{$cls-ui}-tr,
            .#{$prefix}#{$cls-ui}-br,
            .#{$prefix}#{$cls-ui}-tc,
            .#{$prefix}#{$cls-ui}-bc,
            .#{$prefix}#{$cls-ui}-ml,
            .#{$prefix}#{$cls-ui}-mr {
                // @tag iezoomhack
                
                @if $background-color != transparent {
                    background-image: theme-background-image($theme-name, '#{$cls}/#{$cls-ui}-corners.gif', false, $relative-image-path-for-uis);
                }
            }
            
            @if $vertical == true {
                .#{$prefix}#{$cls-ui}-tc,
                .#{$prefix}#{$cls-ui}-bc {
                    // @tag iezoomhack

                    @if $background-color != transparent {
                        background-image: theme-background-image($theme-name, '#{$cls}/#{$cls-ui}-sides.gif', false, $relative-image-path-for-uis);
                        background-position: 0 0;
                        background-repeat: repeat-x;
                    }
                }
            } @else {
                .#{$prefix}#{$cls-ui}-ml,
                .#{$prefix}#{$cls-ui}-mr {
                    // @tag iezoomhack

                    @if $background-color != transparent {
                        background-image: theme-background-image($theme-name, '#{$cls}/#{$cls-ui}-sides.gif', false, $relative-image-path-for-uis);
                        background-position: 0 0;
                        @if $background-gradient == null {
                            background-repeat: repeat-y;
                        }
                    }
                }
            }

            $padding-top: $padding-top - $frame-top;
            $padding-right: $padding-right - $frame-right;
            $padding-bottom: $padding-bottom - $frame-bottom;
            $padding-left: $padding-left - $frame-left;
            
            
            @if $padding-top < 0 {
                $padding-top: 0;
            }
            @if $padding-right < 0 {
                $padding-right: 0;
            }
            @if $padding-bottom < 0 {
                $padding-bottom: 0;
            }
            @if $padding-left < 0 {
                $padding-left: 0;
            }

            .#{$prefix}#{$cls-ui}-mc {
                padding: $padding-top $padding-right $padding-bottom $padding-left;
            }    
        }   
    }
}