/*

		dw_scroll.js

		requires dw_core.js

		last revised: March 2003 

		Contains functions for "scrolling layer content"

		i.e., for onmouseover and onclick scrolling

    

    Functions now included for glide-scroll onclick

    which requires dw_slide.js

    

		This code is from Dynamic Web Coding 

    at http://www.dyn-web.com/

    Copyright 2001-3 by Sharon Paine 

    See Terms of Use at http://www.dyn-web.com/bus/terms.html

    Permission granted to use this code 

    as long as this entire notice is included.		

*/



///////////////////////////////////////////////////////////////////////////////

//  NOTE: dynObj in dw_core.js now used for wndo and scrolling content objects.

//  Argument for creating wndo objects:	id of wndo div.

//	Arguments for creating content (done in loadScrLyr function):

//	id of content div, id of html element that contains content. 

//	NOTE: Netscape 6 needs that html container and its id 

//	in order to get width for horizontal scrolling.

//	If only using vertical scrolling, that extra container

//	is not necessary.

//	You can set left/top in style sheet or pass it to constructor.

//	Width/height (and clip) need to be set in style sheet

//	(opera and ns4 can't reflow content)

///////////////////////////////////////////////////////////////////////////////



var scrTimer = 20; // interval between calls to scroll onmouseover



function stopScroll(num) {

  if (pgLoaded && wndo[num]) {

  	clearTimeout(wndo[num].scrTmId);

  	wndo[num].scrTmId = 0;

  }

}



/////////////////////////////////////////////////////////////////////

// loadScrLyr function: loads scrollable content div(s)

//	arg's: wndo array number, id of scrollable div,

//	and id of table or other html element that contains div content. 

//	NOTE: Ns6+/Mozilla need that html container and its id 

//	in order to get width for horizontal scrolling.

//	If only using vertical scrolling, that extra container

//	is not necessary.

/////////////////////////////////////////////////////////////////////

function loadScrLyr(num,lyr,id) {

	if (!pgLoaded) return; // avoid not loaded errors

	if (typeof wndo[num].cnt != "undefined") wndo[num].cnt.hide();

  wndo[num].scrTmId = 0;

	wndo[num].cnt = new dynObj(lyr);

  // mainly for ns6+/mozilla when scrolling horizontally

  if (id && document.getElementById) 

    wndo[num].cnt.width = document.getElementById(id).offsetWidth;

	wndo[num].cnt.show();

	wndo[num].cnt.shiftTo(0,0);	// restore top/left to 0 

	wndo[num].maxX = wndo[num].cnt.width - wndo[num].width;

	wndo[num].maxY = wndo[num].cnt.height - wndo[num].height

} 



// These functions are for onmouseover scrolling

function inchDown(num,inc) {

	if (!pgLoaded||!wndo[num]) return;

	if (wndo[num].scrTmId) clearTimeout(wndo[num].scrTmId);

	var y = parseInt(wndo[num].cnt.css.top);

	if (y>-wndo[num].maxY) { 

    if ((y-inc)>(-wndo[num].maxY)) wndo[num].cnt.shiftBy(0,-inc);

		else wndo[num].cnt.shiftBy(0,-(wndo[num].maxY-Math.abs(y)));

		wndo[num].scrTmId = setTimeout("inchDown("+num+","+inc+")",scrTimer);	

	}

}



function inchUp(num,inc) {

	if (!pgLoaded||!wndo[num]) return;

	if (wndo[num].scrTmId) clearTimeout(wndo[num].scrTmId);

	var y = parseInt(wndo[num].cnt.css.top);

	if (y<0) { 

    if ((y+inc)<=0) wndo[num].cnt.shiftBy(0,inc); 

		else wndo[num].cnt.shiftBy(0,-y);

		wndo[num].scrTmId = setTimeout("inchUp("+num+","+inc+")",scrTimer);	

  }

}



function inchRight(num,inc) {

	if (!pgLoaded||!wndo[num]) return;

	if (wndo[num].scrTmId) clearTimeout(wndo[num].scrTmId);

	var x = parseInt(wndo[num].cnt.css.left);	

	if (x>-wndo[num].maxX) { 

    if ((x-inc)>(-wndo[num].maxX)) wndo[num].cnt.shiftBy(-inc,0);

		else wndo[num].cnt.shiftBy(-(wndo[num].maxX-Math.abs(x)),0);

		wndo[num].scrTmId = setTimeout("inchRight("+num+","+inc+")",scrTimer);	

	}

}



function inchLeft(num,inc) {

	if (!pgLoaded||!wndo[num]) return;

	if (wndo[num].scrTmId) clearTimeout(wndo[num].scrTmId);

	var x = parseInt(wndo[num].cnt.css.left);

	if (x<0) { 

    if ((x+inc)<=0) wndo[num].cnt.shiftBy(inc,0); 

		else wndo[num].cnt.shiftBy(-x,0); 

		wndo[num].scrTmId = setTimeout("inchLeft("+num+","+inc+")",scrTimer);	

  }

}





// These functions are for onclick scrolling

function jumpDown(num,jump) {

	if (!pgLoaded||!wndo[num]) return;

	var y = parseInt(wndo[num].cnt.css.top);

	if (y>(-wndo[num].maxY)) { 

		if ((y-jump)>(-wndo[num].maxY)) wndo[num].cnt.shiftBy(0,-jump);

		else wndo[num].cnt.shiftBy(0,-(wndo[num].maxY-Math.abs(y)));	

  }

}



function jumpUp(num,jump) {

	if (!pgLoaded||!wndo[num]) return;

	var y = parseInt(wndo[num].cnt.css.top);

	if (y<0) { 

		if ((y+jump)<=0) wndo[num].cnt.shiftBy(0,jump); 

		else wndo[num].cnt.shiftBy(0,-y); 

	}

}



function jumpRight(num,jump) {

	if (!pgLoaded||!wndo[num]) return;

	var x = parseInt(wndo[num].cnt.css.left);

	if (x>(-wndo[num].maxX)) {

		if ((x-jump)>(-wndo[num].maxX)) wndo[num].cnt.shiftBy(-jump,0);

		else wndo[num].cnt.shiftBy(-(wndo[num].maxX-Math.abs(x)),0);	

  }

}



function jumpLeft(num,jump) {

	if (!pgLoaded||!wndo[num]) return;

	var x = parseInt(wndo[num].cnt.css.left);

	if (x<0) { 

		if ((x+jump)<=0) wndo[num].cnt.shiftBy(jump,0); 

		else wndo[num].cnt.shiftBy(-x,0); 

	}

}



// Functions for glide-scrolling onclick  

// NOTE: dw_slide.js needed for glide-scroll

function glideRight(num,dist) {

	if (!pgLoaded||!wndo[num]) return;

	var x = parseInt(wndo[num].cnt.css.left);

	if (x>(-wndo[num].maxX)) {

		if ((x-dist)>(-wndo[num].maxX)) wndo[num].cnt.slideBy(-dist,0,500);

		else wndo[num].cnt.slideBy(-(wndo[num].maxX-Math.abs(x)),0,500);	

  }

}



function glideLeft(num,dist) {

	if (!pgLoaded||!wndo[num]) return;

	var x = parseInt(wndo[num].cnt.css.left);

	if (x<0) { 

		if ((x+dist)<=0) wndo[num].cnt.slideBy(dist,0,500); 

		else wndo[num].cnt.slideBy(-x,0,500); 

	}

}



function glideDown(num,dist) {

	if (!pgLoaded||!wndo[num]) return;

	var y = parseInt(wndo[num].cnt.css.top);

	if (y>(-wndo[num].maxY)) { 

		if ((y-dist)>(-wndo[num].maxY)) wndo[num].cnt.slideBy(0,-dist,500);

		else wndo[num].cnt.slideBy(0,-(wndo[num].maxY-Math.abs(y)),500);	

  }

}



function glideUp(num,dist) {

	if (!pgLoaded||!wndo[num]) return;

	var y = parseInt(wndo[num].cnt.css.top);

	if (y<0) { 

		if ((y+dist)<=0) wndo[num].cnt.slideBy(0,dist,500); 

		else wndo[num].cnt.slideBy(0,-y,500); 

	}

}