
function shortcut(shortcut,callback,opt) {
	//Provide a set of default options
	var default_options = {
		'type':'keydown',
		'propagate':false,
		'target':document
	}
	if(!opt) opt = default_options;
	else {
		for(var dfo in default_options) {
			if(typeof opt[dfo] == 'undefined') opt[dfo] = default_options[dfo];
		}
	}

	var ele = opt.target
	if(typeof opt.target == 'string') ele = document.getElementById(opt.target);
	var ths = this;

	//The function to be called at keypress
	var func = function(e) {
		e = e || window.event;

		//Find Which key is pressed
		if (e.keyCode) code = e.keyCode;
		else if (e.which) code = e.which;
		var character = String.fromCharCode(code).toLowerCase();

		var keys = shortcut.toLowerCase().split("+");
		//Key Pressed - counts the number of valid keypresses - if it is same as the number of keys, the shortcut function is invoked
		var kp = 0;
		
		//Work around for stupid Shift key bug created by using lowercase - as a result the shift+num combination was broken
		var shift_nums = {
			"`":"~",
			"1":"!",
			"2":"@",
			"3":"#",
			"4":"$",
			"5":"%",
			"6":"^",
			"7":"&",
			"8":"*",
			"9":"(",
			"0":")",
			"-":"_",
			"=":"+",
			";":":",
			"'":"\"",
			",":"<",
			".":">",
			"/":"?",
			"\\":"|"
		}
		//Special Keys - and their codes
		var special_keys = {
			'esc':27,
			'escape':27,
			'tab':9,
			'space':32,
			'return':13,
			'enter':13,
			'backspace':8,

			'scrolllock':145,
			'scroll_lock':145,
			'scroll':145,
			'capslock':20,
			'caps_lock':20,
			'caps':20,
			'numlock':144,
			'num_lock':144,
			'num':144,
			
			'pause':19,
			'break':19,
			
			'insert':45,
			'home':36,
			'delete':46,
			'end':35,
			
			'pageup':33,
			'page_up':33,
			'pu':33,

			'pagedown':34,
			'page_down':34,
			'pd':34,

			'left':37,
			'up':38,
			'right':39,
			'down':40,

			'f1':112,
			'f2':113,
			'f3':114,
			'f4':115,
			'f5':116,
			'f6':117,
			'f7':118,
			'f8':119,
			'f9':120,
			'f10':121,
			'f11':122,
			'f12':123
		}


		for(var i=0; k=keys[i],i<keys.length; i++) {
			//Modifiers
			if(k == 'ctrl' || k == 'control') {
				if(e.ctrlKey) kp++;

			} else if(k ==  'shift') {
				if(e.shiftKey) kp++;

			} else if(k == 'alt') {
					if(e.altKey) kp++;

			} else if(k.length > 1) { //If it is a special key
				if(special_keys[k] == code) kp++;

			} else { //The special keys did not match
				if(character == k) kp++;
				else {
					if(shift_nums[character] && e.shiftKey) { //Stupid Shift key bug created by using lowercase
						character = shift_nums[character]; 
						if(character == k) kp++;
					}
				}
			}
		}

		if(kp == keys.length) {
			callback(e);

			if(!opt['propagate']) { //Stop the event
				//e.cancelBubble is supported by IE - this will kill the bubbling process.
				e.cancelBubble = true;
				e.returnValue = false;

				//e.stopPropagation works only in Firefox.
				if (e.stopPropagation) {
					e.stopPropagation();
					e.preventDefault();
				}
				return false;
			}
		}
	}

	//Attach the function with the event	
	if(ele.addEventListener) ele.addEventListener(opt['type'], func, false);
	else if(ele.attachEvent) ele.attachEvent('on'+opt['type'], func);
	else ele['on'+opt['type']] = func;
}