function setupDoubleClick(websiteUrl, dictionary, areaId, maxAllowedWords, target) {
	//warning message for developers
	if (!websiteUrl || !dictionary) {
		alert("Please specify required parameters (websiteurl and dictionary) to setupDoubleClick()")
		return;
	}
	
	//shows the definition layer
	var showLayer = function(e) {
        e.preventDefault();
        var lookup = getSelectedText();
        lookup = lookup.replace(/[\.\*\?;!()\+,\[:\]<>^_`\[\]{}~\\\/\"\'=]/g, " ");
        lookup = lookup.replace(/\s+/g, " ");
        if (lookup != null && lookup.replace("/\s/g", "").length > 0) {
        	//disable the double-click feature if the lookup string
        	//exceeds the maximum number of allowable words
        	if (maxAllowedWords && lookup.split(/[ -]/).length > maxAllowedWords)
				return;

        	//append the layer to the DOM only once
			if (jQuery("#definition_layer").length == 0) {
	    		var imageUrl = websiteUrl + "external/images/doubleclick/definition-layer.gif";
				jQuery("body").append("<div id='definition_layer' style='position:absolute; cursor:pointer;'><img src='" + imageUrl + "' alt='' title=''/></div>");
			}
			
			//move the layer at the cursor position
			jQuery("#definition_layer").map(function() {
				jQuery(this).css({'left' : e.pageX-30, 'top' : e.pageY-40});
			});
			
			//open the definition popup clicking on the layer
			jQuery("#definition_layer").mouseup(function(e) {
				e.stopPropagation();
				openPopup(lookup);
	         });
        } else {
        	jQuery("#definition_layer").remove();
        }
	};
	
	//opens the definition popup 
	var openPopup = function(lookup) {
        var searchUrl = websiteUrl + "search/" + dictionary + "/";
        if (target) {
        	var popup = window.open(searchUrl + "?q=" + lookup, target, "toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=no,copyhistory=no,width=900,height=600,top=300,left=300");
        	if (popup)
        		popup.focus();
        } else {
        	window.open(searchUrl + "?q=" + lookup);
        }
	};
	
	var area = areaId ? "#" + areaId : "body";
	jQuery(area).mouseup(showLayer);
}

/*
 * Cross-browser function to get selected text
 */

function getSelectedText(){
    if(window.getSelection)
        return window.getSelection().toString();
    else if(document.getSelection)
        return document.getSelection();
    else if(document.selection)
        return document.selection.createRange().text;
    return "";
}