//

// tjpzoom 2005.11.29 - 2005.12.02.

// details/usage: http://valid.tjp.hu/zoom/

//



var zoomw=160;

var zoomh=120;

var defzoomamount=4;



var zoomamountstep=1.2;

var zoomsizemin=1000;

var zoomsizemax=100000;

var zoomsizestep=1.2;

var zoomamountmin=1;

var zoomamountmax=12;



function zoom_set(evt) {

 var evt = evt?evt:window.event?window.event:null; if(!evt){ return;}

 if(zoomid=='' || parseInt(document.getElementById(zoomid+'_container').style.width) == 0) {return true;}

 if(evt.keyCode==37 || evt.keyCode==100) {zoomw/=zoomsizestep; zoomh/=zoomsizestep; if(zoomw*zoomh<zoomsizemin) {zoomh=Math.sqrt(zoomsizemin/zoomratio); zoomw=zoomh*zoomratio;} zoom_init(); zoom_move(); return;} //left

 if(evt.keyCode==39 || evt.keyCode==102) {

  zoomw*=zoomsizestep; zoomh*=zoomsizestep;

  if(zoomw*zoomh>zoomsizemax) {zoomh=Math.sqrt(zoomsizemax/zoomratio); zoomw=zoomh*zoomratio;}

  if(zoomw>objw) {zoomw=objw; zoomh=objw/zoomratio;}

  else if(zoomh>objh) {zoomh=objh; zoomw=objh*zoomratio}

  zoom_init(); zoom_move(); return;

 } //right

 if(evt.keyCode==40 || evt.keyCode==98)  {zoomamount/=zoomamountstep; if(zoomamount<zoomamountmin) {zoomamount=zoomamountmin;} zoom_init(); zoom_move(); return;} //down

 if(evt.keyCode==38 || evt.keyCode==104) {zoomamount*=zoomamountstep; if(zoomamount>zoomamountmax) {zoomamount=zoomamountmax;} zoom_init(); zoom_move(); return;} //up

 return;

}



function zoom_init() {

 document.getElementById(zoomid+'_clip').style.width=objw*zoomamount+'px';

 document.getElementById(zoomid+'_clip').style.height=objh*zoomamount+'px';

 setTimeout("document.getElementById('"+zoomid+"_trigger').focus();",0);

}



function zoom_move(evt) {

 if(typeof(evt) == 'object') {

  var evt = evt?evt:window.event?window.event:null; if(!evt){ return;}

  if(evt.pageX) {

   xx=evt.pageX - ffox;

   yy=evt.pageY - ffoy;

  } else {

   if(typeof(document.getElementById(zoomid)+1) == 'number') {return true;} //mert az ie egy ocska kurva

//   xx=evt.x - ieox;

//   yy=evt.y - ieoy;

   xx=evt.clientX - ieox;

   yy=evt.clientY - ieoy;

  }

 } else {

  xx=lastxx; yy=lastyy;

 }

 lastxx=xx; lastyy=yy;

 document.getElementById(zoomid+'_clip').style.margin=((yy-zoomh/2 > 0)?(zoomh/2-yy*zoomamount):(yy*(1-zoomamount)))+'px 0px 0px '+((xx-zoomw/2 > 0)?(zoomw/2-xx*zoomamount):(xx*(1-zoomamount)))+'px';

 document.getElementById(zoomid+'_container').style.margin=((yy-zoomh/2 > 0)?(yy-zoomh/2):(0))+'px 0px 0px '+((xx-zoomw/2 > 0)?(xx-zoomw/2):(0))+'px';



 w2=((xx+zoomw/2<objw)?((zoomw/2<xx)?(zoomw):(zoomw/2+xx)):(zoomw/2+objw-xx)); if(w2<0) {w2=0;} document.getElementById(zoomid+'_container').style.width=w2+'px';

 h2=((yy+zoomh/2<objh)?((zoomh/2<yy)?(zoomh):(zoomh/2+yy)):(zoomh/2+objh-yy)); if(h2<0) {h2=0;} document.getElementById(zoomid+'_container').style.height=h2+'px';

 return false;

}



function zoom_off() {

 if(zoomid != '') {

  document.getElementById(zoomid+'_container').style.width='0px';

  document.getElementById(zoomid+'_container').style.height='0px';

 }

 zoomid='';

}



function countoffset() {

 ieox=0;ieoy=0;

 for(zmi=0;zmi<50;zmi++) {

  zme='document.getElementById(zoomid)';

  for(zmj=1;zmj<=zmi;zmj++) {

   zme+='.offsetParent';

  }

  if(eval(zme)+1 == 1) {zmi=100} else {ieox+=eval(zme+'.offsetLeft'); ieoy+=eval(zme+'.offsetTop');}

 }

 ffox=ieox;

 ffoy=ieoy;

 if(document.documentElement && document.documentElement.scrollTop) {

  ieox-=document.documentElement.scrollLeft;

  ieoy-=document.documentElement.scrollTop;

 } else {

  ieox-=document.body.scrollLeft;

  ieoy-=document.body.scrollTop;

 }

}



function zoom_on(evt,ow,oh,lowres,highres) {

 thisid=lowres+highres+ow+oh;

 thisid='zoom_'+thisid.replace(/[^a-z0-9]/ig,'')

 if(zoomid==thisid) {return;}

 if(typeof(highres) == typeof(nemistudom)) {highres=lowres;}

 var evt = evt?evt:window.event?window.event:null; if(!evt){ return;}

 zoomamount=defzoomamount;

 objw=ow;

 objh=oh;

 zoomid=thisid;

 if(evt.pageX) {

  evt.target.parentNode.id=thisid;

  countoffset();

  lastxx=evt.pageX - ffox; //mert a ff egy ocska kurva

  lastyy=evt.pageY - ffoy;

 } else {

  evt.srcElement.parentNode.id=thisid;

  countoffset();

//  lastxx=evt.x - ieox; //mert az ie egy ocska kurva

//  lastyy=evt.y - ieoy;

  lastxx=evt.clientX - ieox;

  lastyy=evt.clientY - ieoy; 

 }

 document.getElementById(thisid).style.width=ow+'px';

 document.getElementById(thisid).style.height=oh+'px';

 document.getElementById(thisid).style.overflow='hidden';

 document.getElementById(thisid).innerHTML='<div style="position:absolute; overflow:hidden; width:0; height:0;" id="'+thisid+'_container" onmousemove="zoom_move(event);" onmouseout="zoom_off()"><img src="'+highres+'" alt="" id="'+thisid+'_clip" style="padding:0;margin:0;border:0;" /></div><img src="'+lowres+'" id="'+thisid+'_pic" alt="" style="padding:0;margin:0;border:0;width:'+ow+'px; height: '+oh+'px"/><input type="text" id="'+thisid+'_trigger"  style="width:0;height:0;border:0;margin:0; padding:0;overflow:hidden;"/>';

 if(zoomw>objw) {zoomw=objw; zoomh=objw/zoomratio;}

 else if(zoomh>objh) {zoomh=objh; zoomw=objh*zoomratio}

 zoom_init();

 zoom_move('');

 if(document.all) {

  document.onkeydown=zoom_set;

 } else {

  window.captureEvents(Event.KEYDOWN);

  window.onkeydown = zoom_set;

 }

 return false;

}



var zoomamount=defzoomamount; var objw;var objh;var zoomid=''; var zoomratio=zoomw/zoomh; var ieox=0; var ieoy=0; var ffox=0; var ffoy=0;