jQuery(document).ready(function()
{
	SetRollOvers();
	SetEnterSubmit();
	SetExternalLinks();
	//SetBiggerClick();

});

function SetRollOvers(){
	// usage: add the class 'rollover' to image elements
	jQuery("input[type=image].rollover, a.rollover img, img.rollover").hover(function(){
		    $(this).attr("src",jQuery(this).attr("src").replace(/(\.[^.]+)$/, 'Hi$1'));
	    },function(){
		    $(this).attr("src",jQuery(this).attr("src").replace(/Hi(\.[^.]+)$/, '$1'));
	});
}

function SetBiggerClick(){
	// make a '.clickable' element activate the first link it contains (when clicking anywhere on it)
	$(".clickable").biggerlink(); // requires: jquery.biggerlink.pack.js
}

//useage listItems: "ul li"; className: "no-right-margin"; nth == 5";
function SetListClass(listItems, className, nth) {
    var numItems = $(listItems).length;
    var index = 0;
    while (index <= numItems) {
        if (index % eval(nth) == 0) {
            $(listItems).eq(index-1).addClass(className);
        }
        index++;
    }
}

function SetEnterSubmit(){
	// usage: add the class 'submit-on-enter' to any element
	$(".submit-on-enter input[type=text], .submit-on-enter textarea").keydown(function(ev){
        //$(".submit-on-enter").append(ev.keyCode);
        if(ev.keyCode == 13)
        {
            ev.preventDefault();
            ev.stopPropagation();
             //$(".submit-on-enter").append("==submitting");    
             $(this).parents(".submit-on-enter").children("input[type=image], input[type=button]").click();
             return false;
        }
    });
}

function SetExternalLinks(){
	/*
	Purpose: checks all <a>'s in the doc, if it has a rel attribute of 'external', sets to open in new window
	usage: 
	*/
	
	$('a[rel=external]').click(function(){ window.open(this.href); return false; });
	
}

function Equalise(elms){
	// usage:
	// Equalise($(".list li"));
	// Equalise($("#nav, #content"));
	var highest = 0;
	for(i=0; i < elms.length; i++){ if($(elms[i]).height() > highest) highest = $(elms[i]).height(); }
	for(i=0; i < elms.length; i++){ $(elms[i]).height(highest); }
}