/** generic routines **/

function getPageCoords (element) 
{
    var coords = {x: 0, y: 0};
    
	while (element) {
		coords.x += element.offsetLeft;
		coords.y += element.offsetTop;
		element = element.offsetParent;
    }

    return coords;
}

function setEventHandler(element, evt, code)
{
    if( element.addEventListener ) {
	element.addEventListener( evt, code, true );
    } else if( element.attachEvent ) {
	element.attachEvent( "on" + evt, code );
    } else {
	/** this part is hard-coded for obvious reasons **/
	switch( evt ) {
	    case	"click"	    :
		element.onclick = code;
		break;

	    case	"change"    :
		element.onchange = code;
		break;

	    case	"unload"    :
		element.onunload = code;
		break;

	    case	"resize"    :
		element.onresize = code;
		break;
	}
    }
}

function remEventHandler(element, evt, code)
{
    if( element.removeEventListener ) {
	element.removeEventListener( evt, code, true );
    } else if( element.detachEvent ) {
	element.detachEvent( "on" + evt, code );
    } else {
	switch( evt ) {
	    case	"click"	    :
		element.onclick = "";
		break;

	    case	"change"    :
		element.onchange = "";
		break;

	    case	"unload"    :
		element.onunload = "";
		break;

	    case	"resize"    :
		element.onresize = "";
		break;
	}
    }
}

function popWindow(url, width, height, target)
{
    var wnd = window.open( url, target, "status=no,toolbar=no,location=no,menubar=no,resizable=no,width=" + width + ",height=" + height );
    wnd.focus();
}

function onFoc(ct,tx)
{
    if( ct.value == tx )
	ct.value = "";
}

function onBlu(ct,tx)
{
    if( ct.value == "" )
	ct.value = tx;
}

function getDocMetrics()
{
    var metrics = {
	offX : 0,
	offY : 0,
	width : 0,
	height: 0
    };

    if( window.pageXOffset !== undefined ) {
	metrics.offX = window.pageXOffset;
    } else if( document.documentElement.scrollLeft !== undefined ) {
	metrics.offX = document.documentElement.scrollLeft;
    } else if( document.body.scrollLeft !== undefined ) {
	metrics.offX = document.body.scrollLeft;
    }

    if( window.pageYOffset !== undefined ) {
	metrics.offY = window.pageYOffset;
    } else if( document.documentElement.scrollTop !== undefined ) {
	metrics.offY = document.documentElement.scrollTop;
    } else if( document.body.scrollTop !== undefined ) {
	metrics.offY = document.body.scrollTop;
    }

    if( window.innerWidth ) {
	metrics.width = window.innerWidth ;
	metrics.height = window.innerHeight;
    } else if( document.documentElement.clientWidth ) {
	metrics.width = document.documentElement.clientWidth;
	metrics.height = document.documentElement.clientHeight;
    } else if( document.body.clientWidth ) {
	metrics.width = document.body.clientWidth;
	metrics.height = document.body.clientHeight;
    }

    return metrics;
}