finding tab by title

I have made a function that can make it possible to find the index of a certain tab.

ispresent:function(a,b)
	{
	//a = string searchquery
	//b = be case sensitive or not. 'casesensitive' is yes, 'caseinsensitive' is no. Default is no
	//c = index location of of the tab if found. default is -1 and means not found.
	//d = [for loop]string with value of the tab title stripped of all html tags.
	//e = boolean with the result of b.
	//i = for loop iterator.
	var c=-1;
	var e=false;
	if(typeof b != 'undefined')
		{
		switch(b)
			{
			case 'casesensitive':e=true;break;
			case 'caseinsensitive':e=false;a=a.toLowerCase();break;
			default: e=false;break;
			}
		}
	if(typeof a != 'undefined')
		{		
		for(var i = 0; i < $(this.lis).length; i++)
			{
			var d = $(this.lis).eq(i).find("a").html().replace(/(<([^>]+)>)/ig,"");
			if(!e)d=d.toLowerCase();
			if(d==a)
				{
				c = i;
				break;
				}
			else
				{
				c=-1;
				}
			}
		}
	return c;
	}

I'm using this myself to be able to find tabs that my php editor tool has generated, so that I don't open the same tab twice.

This function returns the index of the tab found with the exact title. Options are available for case sensitivity.

It works wonderfully on my code in different browsers.

Useage example:

window.alert($('#tabs').tabs().tabs('ispresent','Articles to edit','casesensitive'));

I bet you guys can improve my code in someway, but I know that a lot of people are dying for a feature like this.