// DHTMLapi.js custom API for cross-platform
// object positioning by Danny Goodman (http://www.dannyg.com).
// Release 2.0. Supports NN4, IE, and W3C DOMs.

// Global variables
var isCSS, isW3C, isIE4, isNN4, isIE6CSS;
// initialize upon load to let all browsers establish content objects
function initDHTMLAPI( ) {
if (document.images) {
    isCSS = (document.body && document.body.style) ? true : false;
    isW3C = (isCSS && document.getElementById) ? true : false;
    isIE4 = (isCSS && document.all) ? true : false;
    isNN4 = (document.layers) ? true : false;
    isIE6CSS = (document.compatMode && document.compatMode.indexOf("CSS1") >= 0) ? true : false;
}
}
// set event handler to initialize API
wolFunctions[wolFunctions.length] = "initDHTMLAPI()";

// Seek nested NN4 layer from string name
function seekLayer(doc, name) {
var theObj;
for (var i = 0; i < doc.layers.length; i++) {
    if (doc.layers[i].name == name) {
	theObj = doc.layers[i];
	break;
    }
    // dive into nested layers if necessary
    if (doc.layers[i].document.layers.length > 0) {
	theObj = seekLayer(document.layers[i].document, name);
    }
}
return theObj;
}

// Convert object name string or object reference
// into a valid element object reference
function getRawObject(obj) {
var theObj;
if (typeof obj == "string") {
    if (isW3C) {
	theObj = document.getElementById(obj);
    } else if (isIE4) {
	theObj = document.all(obj);
    } else if (isNN4) {
	theObj = seekLayer(document, obj);
    }
} else {
    // pass through object reference
    theObj = obj;
}
return theObj;
}

// Convert object name string or object reference
// into a valid style (or NN4 layer) reference
function getObject(obj) {
var theObj = getRawObject(obj);
if (theObj && isCSS) {
    theObj = theObj.style;
}
return theObj;
}

// Position an object at a specific pixel coordinate
function shiftTo(obj, x, y) {
var theObj = getObject(obj);
if (theObj) {
    if (isCSS) {
	// equalize incorrect numeric value type
	var units = (typeof theObj.left == "string") ? "px" : 0; 
	theObj.left = x + units;
	theObj.top = y + units;
    } else if (isNN4) {
	theObj.moveTo(x,y);
    }
}
}

// Move an object by x and/or y pixels
function shiftBy(obj, deltaX, deltaY) {
var theObj = getObject(obj);
if (theObj) {
    if (isCSS) {
	// equalize incorrect numeric value type
	var units = (typeof theObj.left == "string") ? "px" : 0; 
	theObj.left = getObjectLeft(obj) + deltaX + units;
	theObj.top = getObjectTop(obj) + deltaY + units;
    } else if (isNN4) {
	theObj.moveBy(deltaX, deltaY);
    }
}
}

// Set the z-order of an object
function setZIndex(obj, zOrder) {
var theObj = getObject(obj);
if (theObj) {
    theObj.zIndex = zOrder;
}
}

// Set the background color of an object
function setBGColor(obj, color) {
var theObj = getObject(obj);
if (theObj) {
    if (isNN4) {
	theObj.bgColor = color;
    } else if (isCSS) {
	theObj.backgroundColor = color;
    }
}
}


// Retrieve the x coordinate of a positionable object
function getObjectLeft(obj)  {
var elem = getRawObject(obj);
var result = 0;
if (document.defaultView) {
    var style = document.defaultView;
    var cssDecl = style.getComputedStyle(elem, "");
    result = cssDecl.getPropertyValue("left");
} else if (elem.currentStyle) {
    result = elem.currentStyle.left;
} else if (elem.style) {
    result = elem.style.left;
} else if (isNN4) {
    result = elem.left;
}
return parseInt(result);
}

// Retrieve the y coordinate of a positionable object
function getObjectTop(obj)  {
var elem = getRawObject(obj);
var result = 0;
if (document.defaultView) {
    var style = document.defaultView;
    var cssDecl = style.getComputedStyle(elem, "");
    result = cssDecl.getPropertyValue("top");
} else if (elem.currentStyle) {
    result = elem.currentStyle.top;
} else if (elem.style) {
    result = elem.style.top;
} else if (isNN4) {
    result = elem.top;
}
return parseInt(result);
}

function findPosX(obj)
  {
    var curleft = 0;
    if(obj.offsetParent)
        while(1) 
        {
          curleft += obj.offsetLeft;
          if(!obj.offsetParent)
            break;
          obj = obj.offsetParent;
        }
    else if(obj.x)
        curleft += obj.x;
    return curleft;
  }

  function findPosY(obj)
  {
    var curtop = 0;
    if(obj.offsetParent)
        while(1)
        {
          curtop += obj.offsetTop;
          if(!obj.offsetParent)
            break;
          obj = obj.offsetParent;
        }
    else if(obj.y)
        curtop += obj.y;
    return curtop;
  }
  
  
// Retrieve the rendered width of an element
function getObjectWidth(obj)  {
var elem = getRawObject(obj);
var result = 0;
if (elem.offsetWidth) {
    if (elem.scrollWidth && (elem.offsetWidth != elem.scrollWidth)) {
	result = elem.scrollWidth;
    } else {
	result = elem.offsetWidth;
    }
} else if (elem.clip && elem.clip.width) {
    result = elem.clip.width;
} else if (elem.style && elem.style.pixelWidth) {
    result = elem.style.pixelWidth;
}
return parseInt(result);
}

// Retrieve the rendered height of an element
function getObjectHeight(obj)  {
var elem = getRawObject(obj);
var result = 0;
if (elem.offsetHeight) {
    result = elem.offsetHeight;
} else if (elem.clip && elem.clip.height) {
    result = elem.clip.height;
} else if (elem.style && elem.style.pixelHeight) {
    result = elem.style.pixelHeight;
}
return parseInt(result);
}

// Return the available content width space in browser window
function getInsideWindowWidth( ) {
if (window.innerWidth) {
    return window.innerWidth;
} else if (isIE6CSS) {
    // measure the html element's clientWidth
    return document.body.parentElement.clientWidth;
} else if (document.body && document.body.clientWidth) {
    return document.body.clientWidth;
}
return 0;
}

// Return the available content height space in browser window
function getInsideWindowHeight( ) {
if (window.innerHeight) {
    return window.innerHeight;
} else if (isIE6CSS) {
    // measure the html element's clientHeight
    return document.body.parentElement.clientHeight;
} else if (document.body && document.body.clientHeight) {
    return document.body.clientHeight;
}
return 0;
}