function beginDrag( event){

$('#zoom_ajax').val(1);

var elemPos = $('#dragMap').position();

var deltaX = event.pageX - elemPos.left;

var deltaY = event.pageY - elemPos.top;

var start_left = elemPos.left;

var start_top = elemPos.top;

$('#dragMap').mousemove( moveHandler );

$('#dragMap').mouseup( upHandler );

$('#dragMap').click( pan_img );

event.preventDefault();

event.stopPropagation();

function moveHandler(e) {

$('#dragMap').css("cursor", "move");

$('#dragMap').unbind('click', pan_img);

$('#dragMap').css("left", e.pageX - deltaX);

$('#dragMap').css("top", e.pageY - deltaY);

e.stopPropagation();

}

function upHandler(e) {

$('#dragMap').css("cursor", "pointer");

$('#dragMap').unbind('mouseup', upHandler);

$('#dragMap').unbind('mousemove', moveHandler);

var move_y = start_top - (e.pageY - deltaY);

var move_x = start_left - (e.pageX - deltaX);

if((move_y != 0) || (move_x != 0)){

var wide = $('#winw_ajax').val();

var high = $('#winh_ajax').val();

var click_x = wide/2 + move_x;

var click_y = high/2 + move_y;

document.getElementById('clkx_ajax').value = click_x;

document.getElementById('clky_ajax').value = click_y;

send_ajax();

}

e.stopPropagation();

}

function pan_img(e){

$('#dragMap').unbind('mouseup', upHandler);

$('#dragMap').unbind('mousemove', moveHandler);

$('#dragMap').unbind('click', pan_img);

var deltaX = e.pageX - elemPos.left;

var deltaY = e.pageY - elemPos.top;

document.getElementById('clkx_ajax').value = deltaX;

document.getElementById('clky_ajax').value = deltaY;

send_ajax();

}

}

function runquery(event){

var clickx = event.pageX;

var clicky = event.pageY;

var ext = $('#extent_ajax').val();

var winh = $('#winh_ajax').val();

var winw = $('#winw_ajax').val();

var query = $('#query_item > *:selected').val();

$.ajax({

type: "POST",

url: "query.php",

data: {

win_w: winw,

win_h: winh,

img_x: clickx,

img_y: clicky,

extent: ext,

query_layer: query

},

dataType: "json",

success: function(data){

//alert(data);

$('#message1').val(data.result);

}

});

}